91475987 has 2 divisors, whose sum is σ = 91475988. Its totient is φ = 91475986.

The previous prime is 91475983. The next prime is 91476001. The reversal of 91475987 is 78957419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91475987 - 2² = 91475983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91475983) 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, 45737993 + 45737994.

It is an arithmetic number, because the mean of its divisors is an integer number (45737994).

Almost surely, 2^91475987 is an apocalyptic number.

91475987 is a deficient number, since it is larger than the sum of its proper divisors (1).

91475987 is an equidigital number, since it uses as much as digits as its factorization.

91475987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 91475987 is about 9564.3079728750. The cubic root of 91475987 is about 450.5770161786.

The spelling of 91475987 in words is "ninety-one million, four hundred seventy-five thousand, nine hundred eighty-seven".