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85221265 = 517044253
BaseRepresentation
bin1010001010001…
…01111110010001
312221100200121011
411011011332101
5133304040030
612242330521
72053240333
oct505057621
9187320534
1085221265
1144117aa8
1224659a41
131486aaac
14b465453
157735b2a
hex5145f91

85221265 has 4 divisors (see below), whose sum is σ = 102265524. Its totient is φ = 68177008.

The previous prime is 85221259. The next prime is 85221287. The reversal of 85221265 is 56212258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56212258 = 228106129.

It can be written as a sum of positive squares in 2 ways, for example, as 17438976 + 67782289 = 4176^2 + 8233^2 .

It is a cyclic number.

It is not a de Polignac number, because 85221265 - 29 = 85220753 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8522122 + ... + 8522131.

It is an arithmetic number, because the mean of its divisors is an integer number (25566381).

Almost surely, 285221265 is an apocalyptic number.

It is an amenable number.

85221265 is a deficient number, since it is larger than the sum of its proper divisors (17044259).

85221265 is a wasteful number, since it uses less digits than its factorization.

85221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17044258.

The product of its digits is 9600, while the sum is 31.

The square root of 85221265 is about 9231.5364376684. The cubic root of 85221265 is about 440.0641521475.

The spelling of 85221265 in words is "eighty-five million, two hundred twenty-one thousand, two hundred sixty-five".

Divisors: 1 5 17044253 85221265