91994018 has 4 divisors (see below), whose sum is σ = 137991030. Its totient is φ = 45997008.

The previous prime is 91994017. The next prime is 91994027. The reversal of 91994018 is 81049919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81049919 = 239 ⋅339121.

It can be written as a sum of positive squares in only one way, i.e., 57501889 + 34492129 = 7583^2 + 5873^2 .

It is not an unprimeable number, because it can be changed into a prime (91994011) by changing a digit.

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, 22998503 + ... + 22998506.

Almost surely, 2^91994018 is an apocalyptic number.

91994018 is a deficient number, since it is larger than the sum of its proper divisors (45997012).

91994018 is a wasteful number, since it uses less digits than its factorization.

91994018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45997011.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 91994018 is about 9591.3512082501. The cubic root of 91994018 is about 451.4259589563.

The spelling of 91994018 in words is "ninety-one million, nine hundred ninety-four thousand, eighteen".