125759681 has 2 divisors, whose sum is σ = 125759682. Its totient is φ = 125759680.

The previous prime is 125759677. The next prime is 125759687. The reversal of 125759681 is 186957521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90250000 + 35509681 = 9500^2 + 5959^2 .

It is an emirp because it is prime and its reverse (186957521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125759681 - 2² = 125759677 is a prime.

It is a super-2 number, since 2×125759681² = 31630994730443522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125759687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62879840 + 62879841.

It is an arithmetic number, because the mean of its divisors is an integer number (62879841).

Almost surely, 2^125759681 is an apocalyptic number.

It is an amenable number.

125759681 is a deficient number, since it is larger than the sum of its proper divisors (1).

125759681 is an equidigital number, since it uses as much as digits as its factorization.

125759681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 44.

The square root of 125759681 is about 11214.2623921505. The cubic root of 125759681 is about 501.0108629350.

The spelling of 125759681 in words is "one hundred twenty-five million, seven hundred fifty-nine thousand, six hundred eighty-one".