91997854 has 12 divisors (see below), whose sum is σ = 149429016. Its totient is φ = 42460392.

The previous prime is 91997833. The next prime is 91997869. The reversal of 91997854 is 45879919.

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 5 ways as a sum of consecutive naturals, for example, 135754 + ... + 136429.

It is an arithmetic number, because the mean of its divisors is an integer number (12452418).

Almost surely, 2^91997854 is an apocalyptic number.

91997854 is a deficient number, since it is larger than the sum of its proper divisors (57431162).

91997854 is a wasteful number, since it uses less digits than its factorization.

91997854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272211 (or 272198 counting only the distinct ones).

The product of its digits is 816480, while the sum is 52.

The square root of 91997854 is about 9591.5511779899. The cubic root of 91997854 is about 451.4322334436.

The spelling of 91997854 in words is "ninety-one million, nine hundred ninety-seven thousand, eight hundred fifty-four".