125739329081 has 2 divisors, whose sum is σ = 125739329082. Its totient is φ = 125739329080.

The previous prime is 125739329077. The next prime is 125739329087. The reversal of 125739329081 is 180923937521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84530329081 + 41209000000 = 290741^2 + 203000^2 .

It is a cyclic number.

It is not a de Polignac number, because 125739329081 - 2² = 125739329077 is a prime.

It is a super-2 number, since 2×125739329081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125739329087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62869664540 + 62869664541.

It is an arithmetic number, because the mean of its divisors is an integer number (62869664541).

Almost surely, 2^125739329081 is an apocalyptic number.

It is an amenable number.

125739329081 is a deficient number, since it is larger than the sum of its proper divisors (1).

125739329081 is an equidigital number, since it uses as much as digits as its factorization.

125739329081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 125739329081 in words is "one hundred twenty-five billion, seven hundred thirty-nine million, three hundred twenty-nine thousand, eighty-one".