109291999 has 4 divisors (see below), whose sum is σ = 110374200. Its totient is φ = 108209800.

The previous prime is 109291991. The next prime is 109292033. The reversal of 109291999 is 999192901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 109291999 - 2³ = 109291991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109291991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540949 + ... + 541150.

It is an arithmetic number, because the mean of its divisors is an integer number (27593550).

Almost surely, 2^109291999 is an apocalyptic number.

109291999 is a deficient number, since it is larger than the sum of its proper divisors (1082201).

109291999 is a wasteful number, since it uses less digits than its factorization.

109291999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082200.

The product of its (nonzero) digits is 118098, while the sum is 49.

The square root of 109291999 is about 10454.2813717634. The cubic root of 109291999 is about 478.1117934980. Note that the first 3 decimals are identical.

The spelling of 109291999 in words is "one hundred nine million, two hundred ninety-one thousand, nine hundred ninety-nine".