131684257 has 2 divisors, whose sum is σ = 131684258. Its totient is φ = 131684256.

The previous prime is 131684243. The next prime is 131684303. The reversal of 131684257 is 752486131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 7160976 = 11159^2 + 2676^2 .

It is a cyclic number.

It is not a de Polignac number, because 131684257 - 2¹⁵ = 131651489 is a prime.

It is not a weakly prime, because it can be changed into another prime (131684207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65842128 + 65842129.

It is an arithmetic number, because the mean of its divisors is an integer number (65842129).

Almost surely, 2^131684257 is an apocalyptic number.

It is an amenable number.

131684257 is a deficient number, since it is larger than the sum of its proper divisors (1).

131684257 is an equidigital number, since it uses as much as digits as its factorization.

131684257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 131684257 is about 11475.3761158404. The cubic root of 131684257 is about 508.7580404286.

The spelling of 131684257 in words is "one hundred thirty-one million, six hundred eighty-four thousand, two hundred fifty-seven".