125423609 has 2 divisors, whose sum is σ = 125423610. Its totient is φ = 125423608.

The previous prime is 125423587. The next prime is 125423611. The reversal of 125423609 is 906324521.

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., 106090000 + 19333609 = 10300^2 + 4397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125423609 is a prime.

Together with 125423611, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7132883 and since 125423609 and 7132883 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (125423659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62711804 + 62711805.

It is an arithmetic number, because the mean of its divisors is an integer number (62711805).

Almost surely, 2^125423609 is an apocalyptic number.

It is an amenable number.

125423609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125423609 is an equidigital number, since it uses as much as digits as its factorization.

125423609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 125423609 is about 11199.2682350232. The cubic root of 125423609 is about 500.5641751733.

The spelling of 125423609 in words is "one hundred twenty-five million, four hundred twenty-three thousand, six hundred nine".