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87531361 = 677129293
BaseRepresentation
bin1010011011110…
…01111101100001
320002201001110021
411031321331201
5134402000421
612404033441
72112001321
oct515717541
9202631407
1087531361
1145455675
1225392881
1315199408
14b8a7281
157a40341
hex5379f61

87531361 has 4 divisors (see below), whose sum is σ = 87661332. Its totient is φ = 87401392.

The previous prime is 87531337. The next prime is 87531377. The reversal of 87531361 is 16313578.

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 67897600 + 19633761 = 8240^2 + 4431^2 .

It is a cyclic number.

It is not a de Polignac number, because 87531361 - 25 = 87531329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87531331) 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, 63970 + ... + 65323.

It is an arithmetic number, because the mean of its divisors is an integer number (21915333).

Almost surely, 287531361 is an apocalyptic number.

It is an amenable number.

87531361 is a deficient number, since it is larger than the sum of its proper divisors (129971).

87531361 is a wasteful number, since it uses less digits than its factorization.

87531361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129970.

The product of its digits is 15120, while the sum is 34.

The square root of 87531361 is about 9355.8196327206. The cubic root of 87531361 is about 444.0050336929.

The spelling of 87531361 in words is "eighty-seven million, five hundred thirty-one thousand, three hundred sixty-one".

Divisors: 1 677 129293 87531361