91391494 has 4 divisors (see below), whose sum is σ = 137087244. Its totient is φ = 45695746.

The previous prime is 91391477. The next prime is 91391533. The reversal of 91391494 is 49419319.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 22847872 + ... + 22847875.

It is an arithmetic number, because the mean of its divisors is an integer number (34271811).

Almost surely, 2^91391494 is an apocalyptic number.

91391494 is a deficient number, since it is larger than the sum of its proper divisors (45695750).

91391494 is a wasteful number, since it uses less digits than its factorization.

91391494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45695749.

The product of its digits is 34992, while the sum is 40.

The square root of 91391494 is about 9559.8898529219. The cubic root of 91391494 is about 450.4382463129.

The spelling of 91391494 in words is "ninety-one million, three hundred ninety-one thousand, four hundred ninety-four".