91016731377 has 64 divisors (see below), whose sum is σ = 166750617600. Its totient is φ = 48238493760.

The previous prime is 91016731349. The next prime is 91016731397. The reversal of 91016731377 is 77313761019.

91016731377 is a `hidden beast` number, since 91 + 0 + 167 + 31 + 377 = 666.

It is not a de Polignac number, because 91016731377 - 2⁶ = 91016731313 is a prime.

It is a super-2 number, since 2×91016731377² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91016731397) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 546993 + ... + 693710.

It is an arithmetic number, because the mean of its divisors is an integer number (2605478400).

Almost surely, 2^91016731377 is an apocalyptic number.

It is an amenable number.

91016731377 is a deficient number, since it is larger than the sum of its proper divisors (75733886223).

91016731377 is a wasteful number, since it uses less digits than its factorization.

91016731377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240755 (or 1240749 counting only the distinct ones).

The product of its (nonzero) digits is 166698, while the sum is 45.

The spelling of 91016731377 in words is "ninety-one billion, sixteen million, seven hundred thirty-one thousand, three hundred seventy-seven".