91421556730 has 32 divisors (see below), whose sum is σ = 188078086656. Its totient is φ = 31342719744.

The previous prime is 91421556697. The next prime is 91421556757. The reversal of 91421556730 is 3765512419.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1847167 + ... + 1896013.

It is an arithmetic number, because the mean of its divisors is an integer number (5877440208).

Almost surely, 2^91421556730 is an apocalyptic number.

91421556730 is an abundant number, since it is smaller than the sum of its proper divisors (96656529926).

91421556730 is a wasteful number, since it uses less digits than its factorization.

91421556730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75598.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 91421556730 in words is "ninety-one billion, four hundred twenty-one million, five hundred fifty-six thousand, seven hundred thirty".