91039977 has 16 divisors (see below), whose sum is σ = 154142080. Its totient is φ = 52022736.

The previous prime is 91039933. The next prime is 91039997. The reversal of 91039977 is 77993019.

It is not a de Polignac number, because 91039977 - 2¹¹ = 91037929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91039997) 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, 240658 + ... + 241035.

It is an arithmetic number, because the mean of its divisors is an integer number (9633880).

Almost surely, 2^91039977 is an apocalyptic number.

It is an amenable number.

91039977 is a deficient number, since it is larger than the sum of its proper divisors (63102103).

91039977 is a wasteful number, since it uses less digits than its factorization.

91039977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481709 (or 481703 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 91039977 is about 9541.4871482385. The cubic root of 91039977 is about 449.8600008940.

The spelling of 91039977 in words is "ninety-one million, thirty-nine thousand, nine hundred seventy-seven".