91245312 has 144 divisors (see below), whose sum is σ = 277002880. Its totient is φ = 29611008.

The previous prime is 91245311. The next prime is 91245313. The reversal of 91245312 is 21354219.

91245312 is a `hidden beast` number, since 9 + 124 + 531 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (91245311) and next prime (91245313).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91245311) 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, 297063 + ... + 297369.

Almost surely, 2^91245312 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 91245312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138501440).

91245312 is an abundant number, since it is smaller than the sum of its proper divisors (185757568).

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

91245312 is a wasteful number, since it uses less digits than its factorization.

91245312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 355 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 91245312 is about 9552.2412029848. The cubic root of 91245312 is about 450.1979573492.

The spelling of 91245312 in words is "ninety-one million, two hundred forty-five thousand, three hundred twelve".