91912749 has 4 divisors (see below), whose sum is σ = 122550336. Its totient is φ = 61275164.

The previous prime is 91912721. The next prime is 91912783. The reversal of 91912749 is 94721919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91912749 - 2⁹ = 91912237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91912749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91912549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15318789 + ... + 15318794.

It is an arithmetic number, because the mean of its divisors is an integer number (30637584).

Almost surely, 2^91912749 is an apocalyptic number.

It is an amenable number.

91912749 is a deficient number, since it is larger than the sum of its proper divisors (30637587).

91912749 is a wasteful number, since it uses less digits than its factorization.

91912749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30637586.

The product of its digits is 40824, while the sum is 42.

The square root of 91912749 is about 9587.1136949553. The cubic root of 91912749 is about 451.2929874666.

The spelling of 91912749 in words is "ninety-one million, nine hundred twelve thousand, seven hundred forty-nine".