131890261 has 2 divisors, whose sum is σ = 131890262. Its totient is φ = 131890260.

The previous prime is 131890247. The next prime is 131890271. The reversal of 131890261 is 162098131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 53567761 = 8850^2 + 7319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131890261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131890271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65945130 + 65945131.

It is an arithmetic number, because the mean of its divisors is an integer number (65945131).

Almost surely, 2^131890261 is an apocalyptic number.

It is an amenable number.

131890261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131890261 is an equidigital number, since it uses as much as digits as its factorization.

131890261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 131890261 is about 11484.3485230987. The cubic root of 131890261 is about 509.0231988943.

The spelling of 131890261 in words is "one hundred thirty-one million, eight hundred ninety thousand, two hundred sixty-one".