125709839 has 2 divisors, whose sum is σ = 125709840. Its totient is φ = 125709838.

The previous prime is 125709823. The next prime is 125709841. The reversal of 125709839 is 938907521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125709839 - 2⁴ = 125709823 is a prime.

Together with 125709841, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125709839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125709539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62854919 + 62854920.

It is an arithmetic number, because the mean of its divisors is an integer number (62854920).

Almost surely, 2^125709839 is an apocalyptic number.

125709839 is a deficient number, since it is larger than the sum of its proper divisors (1).

125709839 is an equidigital number, since it uses as much as digits as its factorization.

125709839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 125709839 is about 11212.0399125226. The cubic root of 125709839 is about 500.9446660879.

The spelling of 125709839 in words is "one hundred twenty-five million, seven hundred nine thousand, eight hundred thirty-nine".