91338997 has 4 divisors (see below), whose sum is σ = 91410400. Its totient is φ = 91267596.

The previous prime is 91338991. The next prime is 91339007. The reversal of 91338997 is 79983319.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79983319 = 13 ⋅6152563.

It is a cyclic number.

It is not a de Polignac number, because 91338997 - 2¹⁹ = 90814709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91338997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91338991) 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, 33747 + ... + 36352.

It is an arithmetic number, because the mean of its divisors is an integer number (22852600).

Almost surely, 2^91338997 is an apocalyptic number.

It is an amenable number.

91338997 is a deficient number, since it is larger than the sum of its proper divisors (71403).

91338997 is a wasteful number, since it uses less digits than its factorization.

91338997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71402.

The product of its digits is 367416, while the sum is 49.

The square root of 91338997 is about 9557.1437678838. The cubic root of 91338997 is about 450.3519830487.

The spelling of 91338997 in words is "ninety-one million, three hundred thirty-eight thousand, nine hundred ninety-seven".