91972063 has 4 divisors (see below), whose sum is σ = 91991448. Its totient is φ = 91952680.

The previous prime is 91972007. The next prime is 91972093. The reversal of 91972063 is 36027919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91972063 is a prime.

It is a super-3 number, since 3×91972063³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91972093) 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, 2745 + ... + 13837.

It is an arithmetic number, because the mean of its divisors is an integer number (22997862).

Almost surely, 2^91972063 is an apocalyptic number.

91972063 is a deficient number, since it is larger than the sum of its proper divisors (19385).

91972063 is a wasteful number, since it uses less digits than its factorization.

91972063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19384.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 91972063 is about 9590.2066192549. The cubic root of 91972063 is about 451.3900441374.

The spelling of 91972063 in words is "ninety-one million, nine hundred seventy-two thousand, sixty-three".