91757242 has 4 divisors (see below), whose sum is σ = 137635866. Its totient is φ = 45878620.

The previous prime is 91757233. The next prime is 91757249. The reversal of 91757242 is 24275719.

It is a Cunningham number, because it is equal to 9579²+1.

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., 91757241 + 1 = 9579^2 + 1^2 .

It is not an unprimeable number, because it can be changed into a prime (91757249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22939309 + ... + 22939312.

Almost surely, 2^91757242 is an apocalyptic number.

91757242 is a deficient number, since it is larger than the sum of its proper divisors (45878624).

91757242 is a wasteful number, since it uses less digits than its factorization.

91757242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45878623.

The product of its digits is 35280, while the sum is 37.

The square root of 91757242 is about 9579.0000521975. Note that the first 4 decimals coincide. The cubic root of 91757242 is about 451.0383298872.

The spelling of 91757242 in words is "ninety-one million, seven hundred fifty-seven thousand, two hundred forty-two".