91311492 has 48 divisors (see below), whose sum is σ = 231526400. Its totient is φ = 27902880.

The previous prime is 91311491. The next prime is 91311497. The reversal of 91311492 is 29411319.

It is not an unprimeable number, because it can be changed into a prime (91311491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609 + ... + 13527.

Almost surely, 2^91311492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91311492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115763200).

91311492 is an abundant number, since it is smaller than the sum of its proper divisors (140214908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91311492 is a wasteful number, since it uses less digits than its factorization.

91311492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12976 (or 12974 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 91311492 is about 9555.7046835908. The cubic root of 91311492 is about 450.3067735352.

The spelling of 91311492 in words is "ninety-one million, three hundred eleven thousand, four hundred ninety-two".