91977141 has 16 divisors (see below), whose sum is σ = 124488000. Its totient is φ = 60399360.

The previous prime is 91977121. The next prime is 91977169. The reversal of 91977141 is 14177919.

It is not a de Polignac number, because 91977141 - 2⁶ = 91977077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91977141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91977121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60610 + ... + 62108.

It is an arithmetic number, because the mean of its divisors is an integer number (7780500).

Almost surely, 2^91977141 is an apocalyptic number.

It is an amenable number.

91977141 is a deficient number, since it is larger than the sum of its proper divisors (32510859).

91977141 is a wasteful number, since it uses less digits than its factorization.

91977141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its digits is 15876, while the sum is 39.

The square root of 91977141 is about 9590.4713648496. The cubic root of 91977141 is about 451.3983514298.

The spelling of 91977141 in words is "ninety-one million, nine hundred seventy-seven thousand, one hundred forty-one".