13121669 has 4 divisors (see below), whose sum is σ = 14314560. Its totient is φ = 11928780.

The previous prime is 13121657. The next prime is 13121683. The reversal of 13121669 is 96612131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13121669 - 2²⁰ = 12073093 is a prime.

It is a super-2 number, since 2×13121669² = 344356394691122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596429 + ... + 596450.

It is an arithmetic number, because the mean of its divisors is an integer number (3578640).

Almost surely, 2^13121669 is an apocalyptic number.

It is an amenable number.

13121669 is a deficient number, since it is larger than the sum of its proper divisors (1192891).

13121669 is a wasteful number, since it uses less digits than its factorization.

13121669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192890.

The product of its digits is 1944, while the sum is 29.

The square root of 13121669 is about 3622.3844356998. The cubic root of 13121669 is about 235.8647422308.

The spelling of 13121669 in words is "thirteen million, one hundred twenty-one thousand, six hundred sixty-nine".