91219969 has 4 divisors (see below), whose sum is σ = 96021040. Its totient is φ = 86418900.

The previous prime is 91219951. The next prime is 91219979. The reversal of 91219969 is 96991219.

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 a de Polignac number, because none of the positive numbers 2^k-91219969 is a prime.

It is a super-2 number, since 2×91219969² = 16642165488721922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91219939) 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, 2400507 + ... + 2400544.

It is an arithmetic number, because the mean of its divisors is an integer number (24005260).

Almost surely, 2^91219969 is an apocalyptic number.

It is an amenable number.

91219969 is a deficient number, since it is larger than the sum of its proper divisors (4801071).

91219969 is a wasteful number, since it uses less digits than its factorization.

91219969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801070.

The product of its digits is 78732, while the sum is 46.

The square root of 91219969 is about 9550.9145635379. The cubic root of 91219969 is about 450.1562732961.

The spelling of 91219969 in words is "ninety-one million, two hundred nineteen thousand, nine hundred sixty-nine".