91290874 has 4 divisors (see below), whose sum is σ = 136936314. Its totient is φ = 45645436.

The previous prime is 91290853. The next prime is 91290893. The reversal of 91290874 is 47809219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47809219 = 17 ⋅2812307.

It can be written as a sum of positive squares in only one way, i.e., 58629649 + 32661225 = 7657^2 + 5715^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22822717 + ... + 22822720.

Almost surely, 2^91290874 is an apocalyptic number.

91290874 is a deficient number, since it is larger than the sum of its proper divisors (45645440).

91290874 is a wasteful number, since it uses less digits than its factorization.

91290874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45645439.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 91290874 is about 9554.6257906838. The cubic root of 91290874 is about 450.2728781158.

The spelling of 91290874 in words is "ninety-one million, two hundred ninety thousand, eight hundred seventy-four".