91268819 has 4 divisors (see below), whose sum is σ = 91290240. Its totient is φ = 91247400.

The previous prime is 91268813. The next prime is 91268839. The reversal of 91268819 is 91886219.

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

It is a cyclic number.

It is not a de Polignac number, because 91268819 - 2²⁰ = 90220243 is a prime.

It is a super-2 number, since 2×91268819² = 16659994643309522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91268819.

It is not an unprimeable number, because it can be changed into a prime (91268813) 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, 1907 + ... + 13644.

It is an arithmetic number, because the mean of its divisors is an integer number (22822560).

Almost surely, 2^91268819 is an apocalyptic number.

91268819 is a deficient number, since it is larger than the sum of its proper divisors (21421).

91268819 is a wasteful number, since it uses less digits than its factorization.

91268819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21420.

The product of its digits is 62208, while the sum is 44.

The square root of 91268819 is about 9553.4715679694. The cubic root of 91268819 is about 450.2366146584.

The spelling of 91268819 in words is "ninety-one million, two hundred sixty-eight thousand, eight hundred nineteen".