125515081 has 2 divisors, whose sum is σ = 125515082. Its totient is φ = 125515080.

The previous prime is 125515073. The next prime is 125515109. The reversal of 125515081 is 180515521.

It is an a-pointer prime, because the next prime (125515109) can be obtained adding 125515081 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 54686025 = 8416^2 + 7395^2 .

It is a cyclic number.

It is not a de Polignac number, because 125515081 - 2³ = 125515073 is a prime.

It is a super-2 number, since 2×125515081² = 31508071116873122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125515021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62757540 + 62757541.

It is an arithmetic number, because the mean of its divisors is an integer number (62757541).

Almost surely, 2^125515081 is an apocalyptic number.

It is an amenable number.

125515081 is a deficient number, since it is larger than the sum of its proper divisors (1).

125515081 is an equidigital number, since it uses as much as digits as its factorization.

125515081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 125515081 is about 11203.3513289551. The cubic root of 125515081 is about 500.6858335014.

The spelling of 125515081 in words is "one hundred twenty-five million, five hundred fifteen thousand, eighty-one".