125456609 has 2 divisors, whose sum is σ = 125456610. Its totient is φ = 125456608.

The previous prime is 125456587. The next prime is 125456621. The reversal of 125456609 is 906654521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109830400 + 15626209 = 10480^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 125456609 - 2¹² = 125452513 is a prime.

It is not a weakly prime, because it can be changed into another prime (125458609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62728304 + 62728305.

It is an arithmetic number, because the mean of its divisors is an integer number (62728305).

Almost surely, 2^125456609 is an apocalyptic number.

It is an amenable number.

125456609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125456609 is an equidigital number, since it uses as much as digits as its factorization.

125456609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 125456609 is about 11200.7414486720. The cubic root of 125456609 is about 500.6080721966.

The spelling of 125456609 in words is "one hundred twenty-five million, four hundred fifty-six thousand, six hundred nine".