91981477 has 12 divisors (see below), whose sum is σ = 107606880. Its totient is φ = 78393336.

The previous prime is 91981471. The next prime is 91981481. The reversal of 91981477 is 77418919.

It is not a de Polignac number, because 91981477 - 2¹⁵ = 91948709 is a prime.

It is a super-2 number, since 2×91981477² = 16921184222203058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91981471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3528 + ... + 14014.

It is an arithmetic number, because the mean of its divisors is an integer number (8967240).

Almost surely, 2^91981477 is an apocalyptic number.

It is an amenable number.

91981477 is a deficient number, since it is larger than the sum of its proper divisors (15625403).

91981477 is a wasteful number, since it uses less digits than its factorization.

91981477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680 (or 10673 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 91981477 is about 9590.6974198960. The cubic root of 91981477 is about 451.4054446143.

The spelling of 91981477 in words is "ninety-one million, nine hundred eighty-one thousand, four hundred seventy-seven".