91079391 has 8 divisors (see below), whose sum is σ = 130780720. Its totient is φ = 56048832.

The previous prime is 91079383. The next prime is 91079393. The reversal of 91079391 is 19397019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91079391 - 2³ = 91079383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2335369 = 91079391 / (9 + 1 + 0 + 7 + 9 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91079393) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1167646 + ... + 1167723.

It is an arithmetic number, because the mean of its divisors is an integer number (16347590).

Almost surely, 2^91079391 is an apocalyptic number.

91079391 is a deficient number, since it is larger than the sum of its proper divisors (39701329).

91079391 is a wasteful number, since it uses less digits than its factorization.

91079391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335385.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 91079391 is about 9543.5523260472. The cubic root of 91079391 is about 449.9249109278.

The spelling of 91079391 in words is "ninety-one million, seventy-nine thousand, three hundred ninety-one".