131725817 has 2 divisors, whose sum is σ = 131725818. Its totient is φ = 131725816.

The previous prime is 131725787. The next prime is 131725831. The reversal of 131725817 is 718527131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121638841 + 10086976 = 11029^2 + 3176^2 .

It is a cyclic number.

It is not a de Polignac number, because 131725817 - 2¹² = 131721721 is a prime.

It is not a weakly prime, because it can be changed into another prime (131725837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65862908 + 65862909.

It is an arithmetic number, because the mean of its divisors is an integer number (65862909).

Almost surely, 2^131725817 is an apocalyptic number.

It is an amenable number.

131725817 is a deficient number, since it is larger than the sum of its proper divisors (1).

131725817 is an equidigital number, since it uses as much as digits as its factorization.

131725817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 35.

The square root of 131725817 is about 11477.1868068791. The cubic root of 131725817 is about 508.8115567224.

The spelling of 131725817 in words is "one hundred thirty-one million, seven hundred twenty-five thousand, eight hundred seventeen".