125005081 has 2 divisors, whose sum is σ = 125005082. Its totient is φ = 125005080.

The previous prime is 125005073. The next prime is 125005091. The reversal of 125005081 is 180500521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 56115081 = 8300^2 + 7491^2 .

It is an emirp because it is prime and its reverse (180500521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125005081 - 2³ = 125005073 is a prime.

It is a super-2 number, since 2×125005081² = 31252540551633122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125005061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62502540 + 62502541.

It is an arithmetic number, because the mean of its divisors is an integer number (62502541).

Almost surely, 2^125005081 is an apocalyptic number.

It is an amenable number.

125005081 is a deficient number, since it is larger than the sum of its proper divisors (1).

125005081 is an equidigital number, since it uses as much as digits as its factorization.

125005081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 125005081 is about 11180.5671144178. The cubic root of 125005081 is about 500.0067745749.

The spelling of 125005081 in words is "one hundred twenty-five million, five thousand, eighty-one".