131302261 has 2 divisors, whose sum is σ = 131302262. Its totient is φ = 131302260.

The previous prime is 131302229. The next prime is 131302279. The reversal of 131302261 is 162203131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110880900 + 20421361 = 10530^2 + 4519^2 .

It is a cyclic number.

It is not a de Polignac number, because 131302261 - 2⁵ = 131302229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131302211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65651130 + 65651131.

It is an arithmetic number, because the mean of its divisors is an integer number (65651131).

Almost surely, 2^131302261 is an apocalyptic number.

It is an amenable number.

131302261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131302261 is an equidigital number, since it uses as much as digits as its factorization.

131302261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 131302261 is about 11458.7198674197. The cubic root of 131302261 is about 508.2656207457.

Adding to 131302261 its reverse (162203131), we get a palindrome (293505392).

The spelling of 131302261 in words is "one hundred thirty-one million, three hundred two thousand, two hundred sixty-one".