91912894 has 4 divisors (see below), whose sum is σ = 137869344. Its totient is φ = 45956446.

The previous prime is 91912879. The next prime is 91912903. The reversal of 91912894 is 49821919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49821919 = 7 ⋅7117417.

It is a self number, because there is not a number n which added to its sum of digits gives 91912894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22978222 + ... + 22978225.

It is an arithmetic number, because the mean of its divisors is an integer number (34467336).

Almost surely, 2^91912894 is an apocalyptic number.

91912894 is a deficient number, since it is larger than the sum of its proper divisors (45956450).

91912894 is a wasteful number, since it uses less digits than its factorization.

91912894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45956449.

The product of its digits is 46656, while the sum is 43.

The square root of 91912894 is about 9587.1212571866. The cubic root of 91912894 is about 451.2932247839.

The spelling of 91912894 in words is "ninety-one million, nine hundred twelve thousand, eight hundred ninety-four".