17313559561 has 3 divisors (see below), whose sum is σ = 17313691143. Its totient is φ = 17313427980.

The previous prime is 17313559507. The next prime is 17313559573. The reversal of 17313559561 is 16595531371.

It is a happy number.

The square root of 17313559561 is 131581.

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., 3526103161 + 13787456400 = 59381^2 + 117420^2 .

It is not a de Polignac number, because 17313559561 - 2²¹ = 17311462409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17313559261) 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, 65791 + ... + 197371.

It is an arithmetic number, because the mean of its divisors is an integer number (5771230381).

Almost surely, 2^17313559561 is an apocalyptic number.

17313559561 is the 131581-st square number.

17313559561 is the 65791-st centered octagonal number.

It is an amenable number.

17313559561 is a deficient number, since it is larger than the sum of its proper divisors (131582).

17313559561 is an frugal number, since it uses more digits than its factorization.

17313559561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263162 (or 131581 counting only the distinct ones).

The product of its digits is 425250, while the sum is 46.

The spelling of 17313559561 in words is "seventeen billion, three hundred thirteen million, five hundred fifty-nine thousand, five hundred sixty-one".