91951553 has 4 divisors (see below), whose sum is σ = 92076720. Its totient is φ = 91826388.

The previous prime is 91951543. The next prime is 91951567. The reversal of 91951553 is 35515919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91951553 - 2¹⁶ = 91886017 is a prime.

It is a super-2 number, since 2×91951553² = 16910176198223618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91951543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61475 + ... + 62952.

It is an arithmetic number, because the mean of its divisors is an integer number (23019180).

Almost surely, 2^91951553 is an apocalyptic number.

It is an amenable number.

91951553 is a deficient number, since it is larger than the sum of its proper divisors (125167).

91951553 is a wasteful number, since it uses less digits than its factorization.

91951553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125166.

The product of its digits is 30375, while the sum is 38.

The square root of 91951553 is about 9589.1372396061. The cubic root of 91951553 is about 451.3564879401.

The spelling of 91951553 in words is "ninety-one million, nine hundred fifty-one thousand, five hundred fifty-three".