125850409 has 2 divisors, whose sum is σ = 125850410. Its totient is φ = 125850408.

The previous prime is 125850367. The next prime is 125850437. The reversal of 125850409 is 904058521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 60886809 = 8060^2 + 7803^2 .

It is a cyclic number.

It is not a de Polignac number, because 125850409 - 2⁹ = 125849897 is a prime.

It is not a weakly prime, because it can be changed into another prime (125850709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62925204 + 62925205.

It is an arithmetic number, because the mean of its divisors is an integer number (62925205).

Almost surely, 2^125850409 is an apocalyptic number.

It is an amenable number.

125850409 is a deficient number, since it is larger than the sum of its proper divisors (1).

125850409 is an equidigital number, since it uses as much as digits as its factorization.

125850409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 125850409 is about 11218.3068686857. The cubic root of 125850409 is about 501.1313169799.

The spelling of 125850409 in words is "one hundred twenty-five million, eight hundred fifty thousand, four hundred nine".