125765681 has 2 divisors, whose sum is σ = 125765682. Its totient is φ = 125765680.

The previous prime is 125765623. The next prime is 125765699. The reversal of 125765681 is 186567521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 40960000 = 9209^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 125765681 - 2¹⁴ = 125749297 is a prime.

It is a super-2 number, since 2×125765681² = 31634013034787522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125705681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62882840 + 62882841.

It is an arithmetic number, because the mean of its divisors is an integer number (62882841).

Almost surely, 2^125765681 is an apocalyptic number.

It is an amenable number.

125765681 is a deficient number, since it is larger than the sum of its proper divisors (1).

125765681 is an equidigital number, since it uses as much as digits as its factorization.

125765681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 125765681 is about 11214.5299054396. The cubic root of 125765681 is about 501.0188305585.

The spelling of 125765681 in words is "one hundred twenty-five million, seven hundred sixty-five thousand, six hundred eighty-one".