87151231 has 4 divisors (see below), whose sum is σ = 92277792. Its totient is φ = 82024672.

The previous prime is 87151223. The next prime is 87151237. The reversal of 87151231 is 13215178.

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 87151231 - 2³ = 87151223 is a prime.

It is a super-2 number, since 2×87151231² = 15190674129630722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87151231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87151237) 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, 2563255 + ... + 2563288.

It is an arithmetic number, because the mean of its divisors is an integer number (23069448).

Almost surely, 2^87151231 is an apocalyptic number.

87151231 is a deficient number, since it is larger than the sum of its proper divisors (5126561).

87151231 is a wasteful number, since it uses less digits than its factorization.

87151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126560.

The product of its digits is 1680, while the sum is 28.

The square root of 87151231 is about 9335.4823656842. The cubic root of 87151231 is about 443.3613613476.

The spelling of 87151231 in words is "eighty-seven million, one hundred fifty-one thousand, two hundred thirty-one".