87031491 has 4 divisors (see below), whose sum is σ = 116041992. Its totient is φ = 58020992.

The previous prime is 87031463. The next prime is 87031493. The reversal of 87031491 is 19413078.

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 87031491 - 2¹⁰ = 87030467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87031493) 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, 14505246 + ... + 14505251.

It is an arithmetic number, because the mean of its divisors is an integer number (29010498).

Almost surely, 2^87031491 is an apocalyptic number.

87031491 is a deficient number, since it is larger than the sum of its proper divisors (29010501).

87031491 is a wasteful number, since it uses less digits than its factorization.

87031491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29010500.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 87031491 is about 9329.0669951502. The cubic root of 87031491 is about 443.1582186016.

The spelling of 87031491 in words is "eighty-seven million, thirty-one thousand, four hundred ninety-one".