87512431 has 4 divisors (see below), whose sum is σ = 87531192. Its totient is φ = 87493672.

The previous prime is 87512429. The next prime is 87512441. The reversal of 87512431 is 13421578.

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

It is a cyclic number.

It is not a de Polignac number, because 87512431 - 2¹ = 87512429 is a prime.

It is a super-2 number, since 2×87512431² = 15316851159059522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87512393 and 87512402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87512441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (21882798).

Almost surely, 2^87512431 is an apocalyptic number.

87512431 is the 5917-th centered pentagonal number.

87512431 is a deficient number, since it is larger than the sum of its proper divisors (18761).

87512431 is a wasteful number, since it uses less digits than its factorization.

87512431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18760.

The product of its digits is 6720, while the sum is 31.

The square root of 87512431 is about 9354.8079082363. The cubic root of 87512431 is about 443.9730237513.

The spelling of 87512431 in words is "eighty-seven million, five hundred twelve thousand, four hundred thirty-one".