91091902802 has 8 divisors (see below), whose sum is σ = 138877819212. Its totient is φ = 44799296400.

The previous prime is 91091902793. The next prime is 91091902823. The reversal of 91091902802 is 20820919019.

It can be written as a sum of positive squares in 2 ways, for example, as 55102398121 + 35989504681 = 234739^2 + 189709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91091902802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373327349 + ... + 373327592.

Almost surely, 2^91091902802 is an apocalyptic number.

91091902802 is a deficient number, since it is larger than the sum of its proper divisors (47785916410).

91091902802 is a wasteful number, since it uses less digits than its factorization.

91091902802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746655004.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 91091902802 in words is "ninety-one billion, ninety-one million, nine hundred two thousand, eight hundred two".