91909191010 has 32 divisors (see below), whose sum is σ = 203614209792. Its totient is φ = 29087743680.

The previous prime is 91909190957. The next prime is 91909191037. The reversal of 91909191010 is 1019190919.

It is a super-2 number, since 2×91909191010² (a number of 23 digits) contains 22 as substring.

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, 50498646 + ... + 50500465.

It is an arithmetic number, because the mean of its divisors is an integer number (6362944056).

Almost surely, 2^91909191010 is an apocalyptic number.

91909191010 is an abundant number, since it is smaller than the sum of its proper divisors (111705018782).

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

91909191010 is a wasteful number, since it uses less digits than its factorization.

91909191010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100999138.

The product of its (nonzero) digits is 6561, while the sum is 40.

It can be divided in two parts, 919091 and 91010, that added together give a palindrome (1010101).

The spelling of 91909191010 in words is "ninety-one billion, nine hundred nine million, one hundred ninety-one thousand, ten".