125890309 has 2 divisors, whose sum is σ = 125890310. Its totient is φ = 125890308.

The previous prime is 125890291. The next prime is 125890327. The reversal of 125890309 is 903098521.

It is a balanced prime because it is at equal distance from previous prime (125890291) and next prime (125890327).

It can be written as a sum of positive squares in only one way, i.e., 119902500 + 5987809 = 10950^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 125890309 - 2⁵ = 125890277 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125890379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62945154 + 62945155.

It is an arithmetic number, because the mean of its divisors is an integer number (62945155).

Almost surely, 2^125890309 is an apocalyptic number.

It is an amenable number.

125890309 is a deficient number, since it is larger than the sum of its proper divisors (1).

125890309 is an equidigital number, since it uses as much as digits as its factorization.

125890309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 125890309 is about 11220.0850709787. The cubic root of 125890309 is about 501.1842714543.

The spelling of 125890309 in words is "one hundred twenty-five million, eight hundred ninety thousand, three hundred nine".