91611949 has 16 divisors (see below), whose sum is σ = 108710784. Its totient is φ = 76104000.

The previous prime is 91611943. The next prime is 91611953. The reversal of 91611949 is 94911619.

It is a cyclic number.

It is not a de Polignac number, because 91611949 - 2²³ = 83223341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91611943) 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, 11272 + ... + 17614.

It is an arithmetic number, because the mean of its divisors is an integer number (6794424).

Almost surely, 2^91611949 is an apocalyptic number.

It is an amenable number.

91611949 is a deficient number, since it is larger than the sum of its proper divisors (17098835).

91611949 is a wasteful number, since it uses less digits than its factorization.

91611949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468.

The product of its digits is 17496, while the sum is 40.

The square root of 91611949 is about 9571.4131140600. The cubic root of 91611949 is about 450.8001385817.

The spelling of 91611949 in words is "ninety-one million, six hundred eleven thousand, nine hundred forty-nine".