91020102012 has 72 divisors (see below), whose sum is σ = 263306222816. Its totient is φ = 25970212224.

The previous prime is 91020102007. The next prime is 91020102079. The reversal of 91020102012 is 21020102019.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61663 + ... + 431094.

Almost surely, 2^91020102012 is an apocalyptic number.

It is an amenable number.

91020102012 is an abundant number, since it is smaller than the sum of its proper divisors (172286120804).

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

91020102012 is a wasteful number, since it uses less digits than its factorization.

91020102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493507 (or 493502 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 91020102012 in words is "ninety-one billion, twenty million, one hundred two thousand, twelve".