91668994 has 4 divisors (see below), whose sum is σ = 137503494. Its totient is φ = 45834496.

The previous prime is 91668923. The next prime is 91669009. The reversal of 91668994 is 49986619.

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., 88115769 + 3553225 = 9387^2 + 1885^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22917247 + ... + 22917250.

Almost surely, 2^91668994 is an apocalyptic number.

91668994 is a deficient number, since it is larger than the sum of its proper divisors (45834500).

91668994 is a wasteful number, since it uses less digits than its factorization.

91668994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45834499.

The product of its digits is 839808, while the sum is 52.

The square root of 91668994 is about 9574.3926178113. The cubic root of 91668994 is about 450.8936873616.

The spelling of 91668994 in words is "ninety-one million, six hundred sixty-eight thousand, nine hundred ninety-four".