91291612 has 6 divisors (see below), whose sum is σ = 159760328. Its totient is φ = 45645804.

The previous prime is 91291597. The next prime is 91291619. The reversal of 91291612 is 21619219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91291619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11411448 + ... + 11411455.

Almost surely, 2^91291612 is an apocalyptic number.

It is an amenable number.

91291612 is a deficient number, since it is larger than the sum of its proper divisors (68468716).

91291612 is a wasteful number, since it uses less digits than its factorization.

91291612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22822907 (or 22822905 counting only the distinct ones).

The product of its digits is 1944, while the sum is 31.

The square root of 91291612 is about 9554.6644106426. The cubic root of 91291612 is about 450.2740914554.

The spelling of 91291612 in words is "ninety-one million, two hundred ninety-one thousand, six hundred twelve".