125423509 has 2 divisors, whose sum is σ = 125423510. Its totient is φ = 125423508.

The previous prime is 125423491. The next prime is 125423527. The reversal of 125423509 is 905324521.

It is a balanced prime because it is at equal distance from previous prime (125423491) and next prime (125423527).

It can be written as a sum of positive squares in only one way, i.e., 123143409 + 2280100 = 11097^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 125423509 - 2⁵ = 125423477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125423609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62711754 + 62711755.

It is an arithmetic number, because the mean of its divisors is an integer number (62711755).

Almost surely, 2^125423509 is an apocalyptic number.

It is an amenable number.

125423509 is a deficient number, since it is larger than the sum of its proper divisors (1).

125423509 is an equidigital number, since it uses as much as digits as its factorization.

125423509 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 31.

The square root of 125423509 is about 11199.2637704449. The cubic root of 125423509 is about 500.5640421403.

The spelling of 125423509 in words is "one hundred twenty-five million, four hundred twenty-three thousand, five hundred nine".