125722609 has 2 divisors, whose sum is σ = 125722610. Its totient is φ = 125722608.

The previous prime is 125722567. The next prime is 125722631. The reversal of 125722609 is 906227521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122036209 + 3686400 = 11047^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 125722609 - 2¹⁷ = 125591537 is a prime.

It is not a weakly prime, because it can be changed into another prime (125722699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62861304 + 62861305.

It is an arithmetic number, because the mean of its divisors is an integer number (62861305).

Almost surely, 2^125722609 is an apocalyptic number.

It is an amenable number.

125722609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125722609 is an equidigital number, since it uses as much as digits as its factorization.

125722609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 125722609 is about 11212.6093751633. The cubic root of 125722609 is about 500.9616280241.

The spelling of 125722609 in words is "one hundred twenty-five million, seven hundred twenty-two thousand, six hundred nine".