91907409052 has 12 divisors (see below), whose sum is σ = 161386902936. Its totient is φ = 45796865360.

The previous prime is 91907409017. The next prime is 91907409067. The reversal of 91907409052 is 25090470919.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 91907408993 and 91907409011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39208474 + ... + 39210817.

It is an arithmetic number, because the mean of its divisors is an integer number (13448908578).

Almost surely, 2^91907409052 is an apocalyptic number.

It is an amenable number.

91907409052 is a deficient number, since it is larger than the sum of its proper divisors (69479493884).

91907409052 is a wasteful number, since it uses less digits than its factorization.

91907409052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78419588 (or 78419586 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 91907409052 in words is "ninety-one billion, nine hundred seven million, four hundred nine thousand, fifty-two".