125165281 has 2 divisors, whose sum is σ = 125165282. Its totient is φ = 125165280.

The previous prime is 125165279. The next prime is 125165297. The reversal of 125165281 is 182561521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76737600 + 48427681 = 8760^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 125165281 - 2¹ = 125165279 is a prime.

It is a super-2 number, since 2×125165281² = 31332695135617922, which contains 22 as substring.

Together with 125165279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125160281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62582640 + 62582641.

It is an arithmetic number, because the mean of its divisors is an integer number (62582641).

Almost surely, 2^125165281 is an apocalyptic number.

It is an amenable number.

125165281 is a deficient number, since it is larger than the sum of its proper divisors (1).

125165281 is an equidigital number, since it uses as much as digits as its factorization.

125165281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 31.

The square root of 125165281 is about 11187.7290367617. The cubic root of 125165281 is about 500.2202776080.

The spelling of 125165281 in words is "one hundred twenty-five million, one hundred sixty-five thousand, two hundred eighty-one".