91390977 has 16 divisors (see below), whose sum is σ = 140064000. Its totient is φ = 58825872.

The previous prime is 91390951. The next prime is 91390991. The reversal of 91390977 is 77909319.

It is not a de Polignac number, because 91390977 - 2⁸ = 91390721 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91390177) 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, 57577 + ... + 59142.

It is an arithmetic number, because the mean of its divisors is an integer number (8754000).

Almost surely, 2^91390977 is an apocalyptic number.

It is an amenable number.

91390977 is a deficient number, since it is larger than the sum of its proper divisors (48673023).

91390977 is a wasteful number, since it uses less digits than its factorization.

91390977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116757 (or 116751 counting only the distinct ones).

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

The square root of 91390977 is about 9559.8628128232. The cubic root of 91390977 is about 450.4373969376.

The spelling of 91390977 in words is "ninety-one million, three hundred ninety thousand, nine hundred seventy-seven".