13243625261 has 2 divisors, whose sum is σ = 13243625262. Its totient is φ = 13243625260.

The previous prime is 13243625251. The next prime is 13243625281. The reversal of 13243625261 is 16252634231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12277969636 + 965655625 = 110806^2 + 31075^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243625261 - 2¹⁸ = 13243363117 is a prime.

It is a super-2 number, since 2×13243625261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13243625221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6621812630 + 6621812631.

It is an arithmetic number, because the mean of its divisors is an integer number (6621812631).

Almost surely, 2^13243625261 is an apocalyptic number.

It is an amenable number.

13243625261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13243625261 is an equidigital number, since it uses as much as digits as its factorization.

13243625261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The spelling of 13243625261 in words is "thirteen billion, two hundred forty-three million, six hundred twenty-five thousand, two hundred sixty-one".