91146972 has 48 divisors (see below), whose sum is σ = 243613440. Its totient is φ = 25982592.

The previous prime is 91146967. The next prime is 91146973. The reversal of 91146972 is 27964119.

It is a self number, because there is not a number n which added to its sum of digits gives 91146972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91146973) 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, 46843 + ... + 48749.

It is an arithmetic number, because the mean of its divisors is an integer number (5075280).

Almost surely, 2^91146972 is an apocalyptic number.

It is an amenable number.

91146972 is an abundant number, since it is smaller than the sum of its proper divisors (152466468).

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

91146972 is a wasteful number, since it uses less digits than its factorization.

91146972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490 (or 2488 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 91146972 is about 9547.0923322235. The cubic root of 91146972 is about 450.0361649947.

The spelling of 91146972 in words is "ninety-one million, one hundred forty-six thousand, nine hundred seventy-two".