125515142609 has 2 divisors, whose sum is σ = 125515142610. Its totient is φ = 125515142608.

The previous prime is 125515142503. The next prime is 125515142651. The reversal of 125515142609 is 906241515521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108868982209 + 16646160400 = 329953^2 + 129020^2 .

It is a cyclic number.

It is not a de Polignac number, because 125515142609 - 2¹² = 125515138513 is a prime.

It is not a weakly prime, because it can be changed into another prime (125515142689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62757571304 + 62757571305.

It is an arithmetic number, because the mean of its divisors is an integer number (62757571305).

Almost surely, 2^125515142609 is an apocalyptic number.

It is an amenable number.

125515142609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125515142609 is an equidigital number, since it uses as much as digits as its factorization.

125515142609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 125515142609 in words is "one hundred twenty-five billion, five hundred fifteen million, one hundred forty-two thousand, six hundred nine".