91245399 has 12 divisors (see below), whose sum is σ = 141523704. Its totient is φ = 52140144.

The previous prime is 91245373. The next prime is 91245419. The reversal of 91245399 is 99354219.

It is not a de Polignac number, because 91245399 - 2¹¹ = 91243351 is a prime.

It is a super-3 number, since 3×91245399³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91245399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91245359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310212 + ... + 310505.

It is an arithmetic number, because the mean of its divisors is an integer number (11793642).

Almost surely, 2^91245399 is an apocalyptic number.

91245399 is a deficient number, since it is larger than the sum of its proper divisors (50278305).

91245399 is a wasteful number, since it uses less digits than its factorization.

91245399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620734 (or 620727 counting only the distinct ones).

The product of its digits is 87480, while the sum is 42.

The square root of 91245399 is about 9552.2457568888. The cubic root of 91245399 is about 450.1981004331.

The spelling of 91245399 in words is "ninety-one million, two hundred forty-five thousand, three hundred ninety-nine".