91255994 has 4 divisors (see below), whose sum is σ = 136883994. Its totient is φ = 45627996.

The previous prime is 91255987. The next prime is 91256021. The reversal of 91255994 is 49955219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49955219 = 47 ⋅1062877.

It can be written as a sum of positive squares in only one way, i.e., 86025625 + 5230369 = 9275^2 + 2287^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22813997 + ... + 22814000.

Almost surely, 2^91255994 is an apocalyptic number.

91255994 is a deficient number, since it is larger than the sum of its proper divisors (45628000).

91255994 is a wasteful number, since it uses less digits than its factorization.

91255994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45627999.

The product of its digits is 145800, while the sum is 44.

The square root of 91255994 is about 9552.8003224186. The cubic root of 91255994 is about 450.2155247428.

The spelling of 91255994 in words is "ninety-one million, two hundred fifty-five thousand, nine hundred ninety-four".