125135639 has 2 divisors, whose sum is σ = 125135640. Its totient is φ = 125135638.

The previous prime is 125135611. The next prime is 125135641. The reversal of 125135639 is 936531521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125135639 - 2⁸ = 125135383 is a prime.

It is a Sophie Germain prime.

Together with 125135641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125135599 and 125135608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125135669) 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, 62567819 + 62567820.

It is an arithmetic number, because the mean of its divisors is an integer number (62567820).

Almost surely, 2^125135639 is an apocalyptic number.

125135639 is a deficient number, since it is larger than the sum of its proper divisors (1).

125135639 is an equidigital number, since it uses as much as digits as its factorization.

125135639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 35.

The square root of 125135639 is about 11186.4042033175. The cubic root of 125135639 is about 500.1807866245.

The spelling of 125135639 in words is "one hundred twenty-five million, one hundred thirty-five thousand, six hundred thirty-nine".