121697409 has 16 divisors (see below), whose sum is σ = 163900800. Its totient is φ = 80317440.

The previous prime is 121697399. The next prime is 121697417. The reversal of 121697409 is 904796121.

It is not a de Polignac number, because 121697409 - 2⁵ = 121697377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121697449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224679 + ... + 225219.

It is an arithmetic number, because the mean of its divisors is an integer number (10243800).

Almost surely, 2^121697409 is an apocalyptic number.

It is an amenable number.

121697409 is a deficient number, since it is larger than the sum of its proper divisors (42203391).

121697409 is a wasteful number, since it uses less digits than its factorization.

121697409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 121697409 is about 11031.6548622589. The cubic root of 121697409 is about 495.5571850506.

The spelling of 121697409 in words is "one hundred twenty-one million, six hundred ninety-seven thousand, four hundred nine".