109697409 has 10 divisors (see below), whose sum is σ = 163869090. Its totient is φ = 73131552.

The previous prime is 109697383. The next prime is 109697417. The reversal of 109697409 is 904796901.

It can be written as a sum of positive squares in only one way, i.e., 106193025 + 3504384 = 10305^2 + 1872^2 .

It is not a de Polignac number, because 109697409 - 2⁵ = 109697377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109697449) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 677064 + ... + 677225.

It is an arithmetic number, because the mean of its divisors is an integer number (16386909).

Almost surely, 2^109697409 is an apocalyptic number.

It is an amenable number.

109697409 is a deficient number, since it is larger than the sum of its proper divisors (54171681).

109697409 is an equidigital number, since it uses as much as digits as its factorization.

109697409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354301 (or 1354292 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 109697409 is about 10473.6530876290. The cubic root of 109697409 is about 478.7022366209.

The spelling of 109697409 in words is "one hundred nine million, six hundred ninety-seven thousand, four hundred nine".