91043979802 has 16 divisors (see below), whose sum is σ = 137951536320. Its totient is φ = 45060517152.

The previous prime is 91043979797. The next prime is 91043979833. The reversal of 91043979802 is 20897934019.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91043979802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387358 + ... + 576310.

It is an arithmetic number, because the mean of its divisors is an integer number (8621971020).

Almost surely, 2^91043979802 is an apocalyptic number.

91043979802 is a deficient number, since it is larger than the sum of its proper divisors (46907556518).

91043979802 is a wasteful number, since it uses less digits than its factorization.

91043979802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191397.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 91043979802 in words is "ninety-one billion, forty-three million, nine hundred seventy-nine thousand, eight hundred two".