109207979 has 16 divisors (see below), whose sum is σ = 117848640. Its totient is φ = 100932480.

The previous prime is 109207909. The next prime is 109207999. The reversal of 109207979 is 979702901.

It is a cyclic number.

It is not a de Polignac number, because 109207979 - 2¹⁶ = 109142443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109207909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153677 + ... + 154385.

It is an arithmetic number, because the mean of its divisors is an integer number (7365540).

Almost surely, 2^109207979 is an apocalyptic number.

109207979 is a deficient number, since it is larger than the sum of its proper divisors (8640661).

109207979 is a wasteful number, since it uses less digits than its factorization.

109207979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 109207979 is about 10450.2621498219. The cubic root of 109207979 is about 477.9892433519.

The spelling of 109207979 in words is "one hundred nine million, two hundred seven thousand, nine hundred seventy-nine".