91397402 has 4 divisors (see below), whose sum is σ = 137096106. Its totient is φ = 45698700.

The previous prime is 91397381. The next prime is 91397413. The reversal of 91397402 is 20479319.

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., 82283041 + 9114361 = 9071^2 + 3019^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22849349 + ... + 22849352.

Almost surely, 2^91397402 is an apocalyptic number.

91397402 is a deficient number, since it is larger than the sum of its proper divisors (45698704).

91397402 is a wasteful number, since it uses less digits than its factorization.

91397402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45698703.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 91397402 is about 9560.1988473044. The cubic root of 91397402 is about 450.4479522920.

The spelling of 91397402 in words is "ninety-one million, three hundred ninety-seven thousand, four hundred two".