131706557 has 2 divisors, whose sum is σ = 131706558. Its totient is φ = 131706556.

The previous prime is 131706541. The next prime is 131706571. The reversal of 131706557 is 755607131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114682681 + 17023876 = 10709^2 + 4126^2 .

It is a cyclic number.

It is not a de Polignac number, because 131706557 - 2⁴ = 131706541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131706577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65853278 + 65853279.

It is an arithmetic number, because the mean of its divisors is an integer number (65853279).

Almost surely, 2^131706557 is an apocalyptic number.

It is an amenable number.

131706557 is a deficient number, since it is larger than the sum of its proper divisors (1).

131706557 is an equidigital number, since it uses as much as digits as its factorization.

131706557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 131706557 is about 11476.3477204205. The cubic root of 131706557 is about 508.7867572603.

The spelling of 131706557 in words is "one hundred thirty-one million, seven hundred six thousand, five hundred fifty-seven".