13557574969 has 3 divisors (see below), whose sum is σ = 13557691407. Its totient is φ = 13557458532.

The previous prime is 13557574951. The next prime is 13557574973. The reversal of 13557574969 is 96947575531.

It is a happy number.

The square root of 13557574969 is 116437.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5017597225 + 8539977744 = 70835^2 + 92412^2 .

It is not a de Polignac number, because 13557574969 - 2⁷ = 13557574841 is a prime.

It is a super-2 number, since 2×13557574969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13557574909) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 58219 + ... + 174655.

It is an arithmetic number, because the mean of its divisors is an integer number (4519230469).

Almost surely, 2^13557574969 is an apocalyptic number.

13557574969 is the 116437-th square number.

13557574969 is the 58219-th centered octagonal number.

It is an amenable number.

13557574969 is a deficient number, since it is larger than the sum of its proper divisors (116438).

13557574969 is an frugal number, since it uses more digits than its factorization.

13557574969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232874 (or 116437 counting only the distinct ones).

The product of its digits is 35721000, while the sum is 61.

The spelling of 13557574969 in words is "thirteen billion, five hundred fifty-seven million, five hundred seventy-four thousand, nine hundred sixty-nine".