89591987 has 2 divisors, whose sum is σ = 89591988. Its totient is φ = 89591986.

The previous prime is 89591977. The next prime is 89592001. The reversal of 89591987 is 78919598.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89591987 - 2⁸ = 89591731 is a prime.

It is not a weakly prime, because it can be changed into another prime (89591977) 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, 44795993 + 44795994.

It is an arithmetic number, because the mean of its divisors is an integer number (44795994).

Almost surely, 2^89591987 is an apocalyptic number.

89591987 is a deficient number, since it is larger than the sum of its proper divisors (1).

89591987 is an equidigital number, since it uses as much as digits as its factorization.

89591987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 56.

The square root of 89591987 is about 9465.3043796806. The cubic root of 89591987 is about 447.4622370681.

The spelling of 89591987 in words is "eighty-nine million, five hundred ninety-one thousand, nine hundred eighty-seven".