91818794 has 4 divisors (see below), whose sum is σ = 137728194. Its totient is φ = 45909396.

The previous prime is 91818787. The next prime is 91818821. The reversal of 91818794 is 49781819.

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

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 32913169 = 7675^2 + 5737^2 .

It is a super-2 number, since 2×91818794² = 16861381863228872, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22954697 + ... + 22954700.

Almost surely, 2^91818794 is an apocalyptic number.

91818794 is a deficient number, since it is larger than the sum of its proper divisors (45909400).

91818794 is a wasteful number, since it uses less digits than its factorization.

91818794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45909399.

The product of its digits is 145152, while the sum is 47.

The square root of 91818794 is about 9582.2123750207. The cubic root of 91818794 is about 451.1391615498.

The spelling of 91818794 in words is "ninety-one million, eight hundred eighteen thousand, seven hundred ninety-four".