13112992561 has 2 divisors, whose sum is σ = 13112992562. Its totient is φ = 13112992560.

The previous prime is 13112992559. The next prime is 13112992573. The reversal of 13112992561 is 16529921131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10061093025 + 3051899536 = 100305^2 + 55244^2 .

It is a cyclic number.

It is not a de Polignac number, because 13112992561 - 2¹ = 13112992559 is a prime.

Together with 13112992559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13112999561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6556496280 + 6556496281.

It is an arithmetic number, because the mean of its divisors is an integer number (6556496281).

Almost surely, 2^13112992561 is an apocalyptic number.

It is an amenable number.

13112992561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13112992561 is an equidigital number, since it uses as much as digits as its factorization.

13112992561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 40.

The spelling of 13112992561 in words is "thirteen billion, one hundred twelve million, nine hundred ninety-two thousand, five hundred sixty-one".