121613409 has 6 divisors (see below), whose sum is σ = 175663826. Its totient is φ = 81075600.

The previous prime is 121613381. The next prime is 121613411. The reversal of 121613409 is 904316121.

121613409 is a `hidden beast` number, since 1 + 2 + 1 + 613 + 40 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 2039184 = 10935^2 + 1428^2 .

It is not a de Polignac number, because 121613409 - 2⁵ = 121613377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121613449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6756292 + ... + 6756309.

Almost surely, 2^121613409 is an apocalyptic number.

It is an amenable number.

121613409 is a deficient number, since it is larger than the sum of its proper divisors (54050417).

121613409 is a wasteful number, since it uses less digits than its factorization.

121613409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512607 (or 13512604 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 121613409 is about 11027.8469793519. The cubic root of 121613409 is about 495.4431415800.

The spelling of 121613409 in words is "one hundred twenty-one million, six hundred thirteen thousand, four hundred nine".