125839919 has 2 divisors, whose sum is σ = 125839920. Its totient is φ = 125839918.

The previous prime is 125839891. The next prime is 125839951. The reversal of 125839919 is 919938521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125839919 - 2¹² = 125835823 is a prime.

It is a super-2 number, since 2×125839919² = 31671370427853122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125839999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62919959 + 62919960.

It is an arithmetic number, because the mean of its divisors is an integer number (62919960).

Almost surely, 2^125839919 is an apocalyptic number.

125839919 is a deficient number, since it is larger than the sum of its proper divisors (1).

125839919 is an equidigital number, since it uses as much as digits as its factorization.

125839919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 125839919 is about 11217.8393195838. The cubic root of 125839919 is about 501.1173930056.

The spelling of 125839919 in words is "one hundred twenty-five million, eight hundred thirty-nine thousand, nine hundred nineteen".