131645257 has 2 divisors, whose sum is σ = 131645258. Its totient is φ = 131645256.

The previous prime is 131645249. The next prime is 131645287. The reversal of 131645257 is 752546131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130325056 + 1320201 = 11416^2 + 1149^2 .

It is a cyclic number.

It is not a de Polignac number, because 131645257 - 2³ = 131645249 is a prime.

It is equal to p_7466227 and since 131645257 and 7466227 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (131645287) 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, 65822628 + 65822629.

It is an arithmetic number, because the mean of its divisors is an integer number (65822629).

Almost surely, 2^131645257 is an apocalyptic number.

It is an amenable number.

131645257 is a deficient number, since it is larger than the sum of its proper divisors (1).

131645257 is an equidigital number, since it uses as much as digits as its factorization.

131645257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 131645257 is about 11473.6766992974. The cubic root of 131645257 is about 508.7078103729.

The spelling of 131645257 in words is "one hundred thirty-one million, six hundred forty-five thousand, two hundred fifty-seven".