91579397 has 8 divisors (see below), whose sum is σ = 112713216. Its totient is φ = 72458352.

The previous prime is 91579393. The next prime is 91579409. The reversal of 91579397 is 79397519.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91579397 - 2² = 91579393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91579393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503093 + ... + 503274.

It is an arithmetic number, because the mean of its divisors is an integer number (14089152).

Almost surely, 2^91579397 is an apocalyptic number.

It is an amenable number.

91579397 is a deficient number, since it is larger than the sum of its proper divisors (21133819).

91579397 is a wasteful number, since it uses less digits than its factorization.

91579397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006387.

The product of its digits is 535815, while the sum is 50.

The square root of 91579397 is about 9569.7124826193. The cubic root of 91579397 is about 450.7467387626.

The spelling of 91579397 in words is "ninety-one million, five hundred seventy-nine thousand, three hundred ninety-seven".