91980917 has 16 divisors (see below), whose sum is σ = 109734912. Its totient is φ = 75454080.

The previous prime is 91980907. The next prime is 91980961. The reversal of 91980917 is 71908919.

It is a cyclic number.

It is not a de Polignac number, because 91980917 - 2⁴ = 91980901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91980907) 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, 12188 + ... + 18234.

It is an arithmetic number, because the mean of its divisors is an integer number (6858432).

Almost surely, 2^91980917 is an apocalyptic number.

It is an amenable number.

91980917 is a deficient number, since it is larger than the sum of its proper divisors (17753995).

91980917 is a wasteful number, since it uses less digits than its factorization.

91980917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6148.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 91980917 is about 9590.6682248944. The cubic root of 91980917 is about 451.4045285329.

The spelling of 91980917 in words is "ninety-one million, nine hundred eighty thousand, nine hundred seventeen".