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87117313 = 261733289
BaseRepresentation
bin1010011000101…
…00111000000001
320001221000111011
411030110320001
5134300223223
612351120521
72105325223
oct514247001
9201830434
1087117313
11451a2588
1225213141
1315082b0a
14b7da413
1579ac80d
hex5314e01

87117313 has 4 divisors (see below), whose sum is σ = 87153220. Its totient is φ = 87081408.

The previous prime is 87117293. The next prime is 87117323. The reversal of 87117313 is 31371178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44515584 + 42601729 = 6672^2 + 6527^2 .

It is a cyclic number.

It is not a de Polignac number, because 87117313 - 25 = 87117281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87117323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14028 + ... + 19261.

It is an arithmetic number, because the mean of its divisors is an integer number (21788305).

Almost surely, 287117313 is an apocalyptic number.

It is an amenable number.

87117313 is a deficient number, since it is larger than the sum of its proper divisors (35907).

87117313 is a wasteful number, since it uses less digits than its factorization.

87117313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35906.

The product of its digits is 3528, while the sum is 31.

The square root of 87117313 is about 9333.6655714676. The cubic root of 87117313 is about 443.3038372723.

The spelling of 87117313 in words is "eighty-seven million, one hundred seventeen thousand, three hundred thirteen".

Divisors: 1 2617 33289 87117313