109409279 has 16 divisors (see below), whose sum is σ = 130830336. Its totient is φ = 89534400.

The previous prime is 109409273. The next prime is 109409303. The reversal of 109409279 is 972904901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 109409279 - 2¹⁶ = 109343743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109409273) 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, 9434 + ... + 17544.

It is an arithmetic number, because the mean of its divisors is an integer number (8176896).

Almost surely, 2^109409279 is an apocalyptic number.

109409279 is a deficient number, since it is larger than the sum of its proper divisors (21421057).

109409279 is an equidigital number, since it uses as much as digits as its factorization.

109409279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8206.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 109409279 is about 10459.8890529489. The cubic root of 109409279 is about 478.2827511360.

The spelling of 109409279 in words is "one hundred nine million, four hundred nine thousand, two hundred seventy-nine".