91617897 has 24 divisors (see below), whose sum is σ = 142500000. Its totient is φ = 52206336.

The previous prime is 91617893. The next prime is 91617919. The reversal of 91617897 is 79871619.

It is a happy number.

It is not a de Polignac number, because 91617897 - 2² = 91617893 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91617893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72729 + ... + 73977.

It is an arithmetic number, because the mean of its divisors is an integer number (5937500).

Almost surely, 2^91617897 is an apocalyptic number.

It is an amenable number.

91617897 is a deficient number, since it is larger than the sum of its proper divisors (50882103).

91617897 is a wasteful number, since it uses less digits than its factorization.

91617897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765 (or 1758 counting only the distinct ones).

The product of its digits is 190512, while the sum is 48.

The square root of 91617897 is about 9571.7238259365. The cubic root of 91617897 is about 450.8098945914.

The spelling of 91617897 in words is "ninety-one million, six hundred seventeen thousand, eight hundred ninety-seven".