91140399 has 12 divisors (see below), whose sum is σ = 150454096. Its totient is φ = 52080192.

The previous prime is 91140389. The next prime is 91140419. The reversal of 91140399 is 99304119.

It is not a de Polignac number, because 91140399 - 2⁵ = 91140367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91140319) 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, 723274 + ... + 723399.

Almost surely, 2^91140399 is an apocalyptic number.

91140399 is a deficient number, since it is larger than the sum of its proper divisors (59313697).

91140399 is a wasteful number, since it uses less digits than its factorization.

91140399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446686 (or 1446683 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 91140399 is about 9546.7480850811. The cubic root of 91140399 is about 450.0253467204.

The spelling of 91140399 in words is "ninety-one million, one hundred forty thousand, three hundred ninety-nine".