87156631 has 2 divisors, whose sum is σ = 87156632. Its totient is φ = 87156630.

The previous prime is 87156623. The next prime is 87156647. The reversal of 87156631 is 13665178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87156631 - 2³ = 87156623 is a prime.

It is a super-2 number, since 2×87156631² = 15192556654540322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87156431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43578315 + 43578316.

It is an arithmetic number, because the mean of its divisors is an integer number (43578316).

Almost surely, 2^87156631 is an apocalyptic number.

87156631 is a deficient number, since it is larger than the sum of its proper divisors (1).

87156631 is an equidigital number, since it uses as much as digits as its factorization.

87156631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 87156631 is about 9335.7715803248. The cubic root of 87156631 is about 443.3705182345.

The spelling of 87156631 in words is "eighty-seven million, one hundred fifty-six thousand, six hundred thirty-one".