13031261 has 2 divisors, whose sum is σ = 13031262. Its totient is φ = 13031260.

The previous prime is 13031243. The next prime is 13031309. The reversal of 13031261 is 16213031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 3728761 = 3050^2 + 1931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13031261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13031201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6515630 + 6515631.

It is an arithmetic number, because the mean of its divisors is an integer number (6515631).

Almost surely, 2^13031261 is an apocalyptic number.

It is an amenable number.

13031261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13031261 is an equidigital number, since it uses as much as digits as its factorization.

13031261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 13031261 is about 3609.8837931435. The cubic root of 13031261 is about 235.3217924470.

Adding to 13031261 its reverse (16213031), we get a palindrome (29244292).

The spelling of 13031261 in words is "thirteen million, thirty-one thousand, two hundred sixty-one".