91919191010 has 16 divisors (see below), whose sum is σ = 168258859200. Its totient is φ = 36144495216.

The previous prime is 91919190973. The next prime is 91919191061. The reversal of 91919191010 is 1019191919.

It is a happy number.

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, 77897030 + ... + 77898209.

It is an arithmetic number, because the mean of its divisors is an integer number (10516178700).

Almost surely, 2^91919191010 is an apocalyptic number.

91919191010 is a deficient number, since it is larger than the sum of its proper divisors (76339668190).

91919191010 is a wasteful number, since it uses less digits than its factorization.

91919191010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155795305.

The product of its (nonzero) digits is 6561, while the sum is 41.

The spelling of 91919191010 in words is "ninety-one billion, nine hundred nineteen million, one hundred ninety-one thousand, ten".