87172331 has 2 divisors, whose sum is σ = 87172332. Its totient is φ = 87172330.

The previous prime is 87172249. The next prime is 87172339. The reversal of 87172331 is 13327178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87172331 - 2²⁶ = 20063467 is a prime.

It is a super-2 number, since 2×87172331² = 15198030583947122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87172339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43586165 + 43586166.

It is an arithmetic number, because the mean of its divisors is an integer number (43586166).

Almost surely, 2^87172331 is an apocalyptic number.

87172331 is a deficient number, since it is larger than the sum of its proper divisors (1).

87172331 is an equidigital number, since it uses as much as digits as its factorization.

87172331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 87172331 is about 9336.6123942252. The cubic root of 87172331 is about 443.3971388872.

The spelling of 87172331 in words is "eighty-seven million, one hundred seventy-two thousand, three hundred thirty-one".