125120981 has 2 divisors, whose sum is σ = 125120982. Its totient is φ = 125120980.

The previous prime is 125120977. The next prime is 125120999. The reversal of 125120981 is 189021521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99820081 + 25300900 = 9991^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 125120981 - 2² = 125120977 is a prime.

It is a super-2 number, since 2×125120981² = 31310519772804722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62560490 + 62560491.

It is an arithmetic number, because the mean of its divisors is an integer number (62560491).

Almost surely, 2^125120981 is an apocalyptic number.

It is an amenable number.

125120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

125120981 is an equidigital number, since it uses as much as digits as its factorization.

125120981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 125120981 is about 11185.7490138122. The cubic root of 125120981 is about 500.1612559874.

The spelling of 125120981 in words is "one hundred twenty-five million, one hundred twenty thousand, nine hundred eighty-one".