91121624 has 16 divisors (see below), whose sum is σ = 186385320. Its totient is φ = 41418880.

The previous prime is 91121623. The next prime is 91121629. The reversal of 91121624 is 42612119.

It is a junction number, because it is equal to n+sod(n) for n = 91121593 and 91121602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91121621) 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, 517649 + ... + 517824.

Almost surely, 2^91121624 is an apocalyptic number.

It is an amenable number.

91121624 is an abundant number, since it is smaller than the sum of its proper divisors (95263696).

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

91121624 is a wasteful number, since it uses less digits than its factorization.

91121624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035490 (or 1035486 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 91121624 is about 9545.7647153070. The cubic root of 91121624 is about 449.9944427297.

The spelling of 91121624 in words is "ninety-one million, one hundred twenty-one thousand, six hundred twenty-four".