87031691 has 2 divisors, whose sum is σ = 87031692. Its totient is φ = 87031690.

The previous prime is 87031657. The next prime is 87031741. The reversal of 87031691 is 19613078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87031691 - 2⁶ = 87031627 is a prime.

It is equal to p_5054957 and since 87031691 and 5054957 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87031621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43515845 + 43515846.

It is an arithmetic number, because the mean of its divisors is an integer number (43515846).

Almost surely, 2^87031691 is an apocalyptic number.

87031691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87031691 is an equidigital number, since it uses as much as digits as its factorization.

87031691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 87031691 is about 9329.0777143295. The cubic root of 87031691 is about 443.1585580633.

The spelling of 87031691 in words is "eighty-seven million, thirty-one thousand, six hundred ninety-one".