125670121 has 2 divisors, whose sum is σ = 125670122. Its totient is φ = 125670120.

The previous prime is 125670053. The next prime is 125670131. The reversal of 125670121 is 121076521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122412096 + 3258025 = 11064^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 125670121 - 2²³ = 117281513 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (125670131) 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, 62835060 + 62835061.

It is an arithmetic number, because the mean of its divisors is an integer number (62835061).

Almost surely, 2^125670121 is an apocalyptic number.

It is an amenable number.

125670121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125670121 is an equidigital number, since it uses as much as digits as its factorization.

125670121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 125670121 is about 11210.2685516450. The cubic root of 125670121 is about 500.8919027397.

The spelling of 125670121 in words is "one hundred twenty-five million, six hundred seventy thousand, one hundred twenty-one".