91653939 has 18 divisors (see below), whose sum is σ = 143358540. Its totient is φ = 56401488.

The previous prime is 91653911. The next prime is 91653973. The reversal of 91653939 is 93935619.

It is not a de Polignac number, because 91653939 - 2⁷ = 91653811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91653894 and 91653903.

It is not an unprimeable number, because it can be changed into a prime (91653439) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28609 + ... + 31650.

Almost surely, 2^91653939 is an apocalyptic number.

91653939 is a deficient number, since it is larger than the sum of its proper divisors (51704601).

91653939 is a wasteful number, since it uses less digits than its factorization.

91653939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60291 (or 60275 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 91653939 is about 9573.6063737758. The cubic root of 91653939 is about 450.8690022570.

The spelling of 91653939 in words is "ninety-one million, six hundred fifty-three thousand, nine hundred thirty-nine".