109991156 has 24 divisors (see below), whose sum is σ = 222336576. Its totient is φ = 47054720.

The previous prime is 109991111. The next prime is 109991177. The reversal of 109991156 is 651199901.

It is a congruent 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, 72776 + ... + 74271.

It is an arithmetic number, because the mean of its divisors is an integer number (9264024).

Almost surely, 2^109991156 is an apocalyptic number.

It is an amenable number.

109991156 is an abundant number, since it is smaller than the sum of its proper divisors (112345420).

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

109991156 is a wasteful number, since it uses less digits than its factorization.

109991156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147079 (or 147077 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 109991156 is about 10487.6668520696. Note that the first 3 decimals coincide. The cubic root of 109991156 is about 479.1291443569.

The spelling of 109991156 in words is "one hundred nine million, nine hundred ninety-one thousand, one hundred fifty-six".