91339409 has 4 divisors (see below), whose sum is σ = 104387904. Its totient is φ = 78290916.

The previous prime is 91339399. The next prime is 91339411. The reversal of 91339409 is 90493319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91339409 - 2⁴ = 91339393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91339459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6524237 + ... + 6524250.

It is an arithmetic number, because the mean of its divisors is an integer number (26096976).

Almost surely, 2^91339409 is an apocalyptic number.

It is an amenable number.

91339409 is a deficient number, since it is larger than the sum of its proper divisors (13048495).

91339409 is a wasteful number, since it uses less digits than its factorization.

91339409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13048494.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 91339409 is about 9557.1653224165. The cubic root of 91339409 is about 450.3526601773.

The spelling of 91339409 in words is "ninety-one million, three hundred thirty-nine thousand, four hundred nine".