191000110920 has 64 divisors (see below), whose sum is σ = 588486841920. Its totient is φ = 49556784384.

The previous prime is 191000110919. The next prime is 191000110933. The reversal of 191000110920 is 29011000191.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 21504582 + ... + 21513461.

It is an arithmetic number, because the mean of its divisors is an integer number (9195106905).

Almost surely, 2^191000110920 is an apocalyptic number.

191000110920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191000110920 is an abundant number, since it is smaller than the sum of its proper divisors (397486731000).

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

191000110920 is a wasteful number, since it uses less digits than its factorization.

191000110920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43018094 (or 43018090 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 24.

The spelling of 191000110920 in words is "one hundred ninety-one billion, one hundred ten thousand, nine hundred twenty".