91957966 has 8 divisors (see below), whose sum is σ = 142386624. Its totient is φ = 44495760.

The previous prime is 91957963. The next prime is 91958003. The reversal of 91957966 is 66975919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91957961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741535 + ... + 741658.

It is an arithmetic number, because the mean of its divisors is an integer number (17798328).

Almost surely, 2^91957966 is an apocalyptic number.

91957966 is a deficient number, since it is larger than the sum of its proper divisors (50428658).

91957966 is a wasteful number, since it uses less digits than its factorization.

91957966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483226.

The product of its digits is 918540, while the sum is 52.

The square root of 91957966 is about 9589.4716225661. The cubic root of 91957966 is about 451.3669807187.

It can be divided in two parts, 9195 and 7966, that added together give a square (17161 = 131²).

The spelling of 91957966 in words is "ninety-one million, nine hundred fifty-seven thousand, nine hundred sixty-six".