91945231 has 8 divisors (see below), whose sum is σ = 111261600. Its totient is φ = 74174208.

The previous prime is 91945229. The next prime is 91945253. The reversal of 91945231 is 13254919.

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

It is a cyclic number.

It is not a de Polignac number, because 91945231 - 2¹ = 91945229 is a prime.

It is a super-2 number, since 2×91945231² = 16907851007286722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386206 + ... + 386443.

It is an arithmetic number, because the mean of its divisors is an integer number (13907700).

Almost surely, 2^91945231 is an apocalyptic number.

91945231 is a deficient number, since it is larger than the sum of its proper divisors (19316369).

91945231 is a wasteful number, since it uses less digits than its factorization.

91945231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772673.

The product of its digits is 9720, while the sum is 34.

The square root of 91945231 is about 9588.8075901021. The cubic root of 91945231 is about 451.3461435757.

The spelling of 91945231 in words is "ninety-one million, nine hundred forty-five thousand, two hundred thirty-one".