125504609 has 2 divisors, whose sum is σ = 125504610. Its totient is φ = 125504608.

The previous prime is 125504569. The next prime is 125504651. The reversal of 125504609 is 906405521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118744609 + 6760000 = 10897^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125504609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125504669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62752304 + 62752305.

It is an arithmetic number, because the mean of its divisors is an integer number (62752305).

Almost surely, 2^125504609 is an apocalyptic number.

It is an amenable number.

125504609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125504609 is an equidigital number, since it uses as much as digits as its factorization.

125504609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 125504609 is about 11202.8839590527. The cubic root of 125504609 is about 500.6719086730.

The spelling of 125504609 in words is "one hundred twenty-five million, five hundred four thousand, six hundred nine".