125281681 has 18 divisors (see below), whose sum is σ = 147775122. Its totient is φ = 105900480.

The previous prime is 125281679. The next prime is 125281753. The reversal of 125281681 is 186182521.

It can be written as a sum of positive squares in only one way, i.e., 116964225 + 8317456 = 10815^2 + 2884^2 .

It is not a de Polignac number, because 125281681 - 2¹ = 125281679 is a prime.

It is a super-2 number, since 2×125281681² = 31390999188371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125281081) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 519721 + ... + 519961.

It is an arithmetic number, because the mean of its divisors is an integer number (8209729).

Almost surely, 2^125281681 is an apocalyptic number.

It is an amenable number.

125281681 is a deficient number, since it is larger than the sum of its proper divisors (22493441).

125281681 is an equidigital number, since it uses as much as digits as its factorization.

125281681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 351 counting only the distinct ones).

The product of its digits is 7680, while the sum is 34.

The square root of 125281681 is about 11192.9299560035. The cubic root of 125281681 is about 500.3752929067.

The spelling of 125281681 in words is "one hundred twenty-five million, two hundred eighty-one thousand, six hundred eighty-one".