91208042 has 4 divisors (see below), whose sum is σ = 136812066. Its totient is φ = 45604020.

The previous prime is 91208027. The next prime is 91208053. The reversal of 91208042 is 24080219.

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., 69872881 + 21335161 = 8359^2 + 4619^2 .

It is an unprimeable number.

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, 22802009 + ... + 22802012.

Almost surely, 2^91208042 is an apocalyptic number.

91208042 is a deficient number, since it is larger than the sum of its proper divisors (45604024).

91208042 is a wasteful number, since it uses less digits than its factorization.

91208042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45604023.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 91208042 is about 9550.2901526603. The cubic root of 91208042 is about 450.1366531480.

The spelling of 91208042 in words is "ninety-one million, two hundred eight thousand, forty-two".