91200020002 has 24 divisors (see below), whose sum is σ = 171375864156. Its totient is φ = 36079128288.

The previous prime is 91200019993. The next prime is 91200020047. The reversal of 91200020002 is 20002000219.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65398344361 + 25801675641 = 255731^2 + 160629^2 .

91200020002 is a modest number, since divided by 20002 gives 912 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35791513 + ... + 35794060.

Almost surely, 2^91200020002 is an apocalyptic number.

91200020002 is a deficient number, since it is larger than the sum of its proper divisors (80175844154).

91200020002 is a wasteful number, since it uses less digits than its factorization.

91200020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71585602 (or 71585595 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The spelling of 91200020002 in words is "ninety-one billion, two hundred million, twenty thousand, two".