91549994 has 4 divisors (see below), whose sum is σ = 137324994. Its totient is φ = 45774996.

The previous prime is 91549963. The next prime is 91550009. The reversal of 91549994 is 49994519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49994519 = 919 ⋅54401.

It can be written as a sum of positive squares in only one way, i.e., 86731969 + 4818025 = 9313^2 + 2195^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22887497 + ... + 22887500.

Almost surely, 2^91549994 is an apocalyptic number.

91549994 is a deficient number, since it is larger than the sum of its proper divisors (45775000).

91549994 is a wasteful number, since it uses less digits than its factorization.

91549994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45774999.

The product of its digits is 524880, while the sum is 50.

The square root of 91549994 is about 9568.1761062388. The cubic root of 91549994 is about 450.6984938318.

The spelling of 91549994 in words is "ninety-one million, five hundred forty-nine thousand, nine hundred ninety-four".