91997495 has 4 divisors (see below), whose sum is σ = 110397000. Its totient is φ = 73597992.

The previous prime is 91997473. The next prime is 91997509. The reversal of 91997495 is 59479919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91997495 - 2¹⁴ = 91981111 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9199745 + ... + 9199754.

It is an arithmetic number, because the mean of its divisors is an integer number (27599250).

Almost surely, 2^91997495 is an apocalyptic number.

91997495 is a deficient number, since it is larger than the sum of its proper divisors (18399505).

91997495 is a wasteful number, since it uses less digits than its factorization.

91997495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18399504.

The product of its digits is 918540, while the sum is 53.

The square root of 91997495 is about 9591.5324635847. The cubic root of 91997495 is about 451.4316462401.

The spelling of 91997495 in words is "ninety-one million, nine hundred ninety-seven thousand, four hundred ninety-five".