125421929 has 2 divisors, whose sum is σ = 125421930. Its totient is φ = 125421928.

The previous prime is 125421887. The next prime is 125421949. The reversal of 125421929 is 929124521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 3429904 = 11045^2 + 1852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125421929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125421949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62710964 + 62710965.

It is an arithmetic number, because the mean of its divisors is an integer number (62710965).

Almost surely, 2^125421929 is an apocalyptic number.

It is an amenable number.

125421929 is a deficient number, since it is larger than the sum of its proper divisors (1).

125421929 is an equidigital number, since it uses as much as digits as its factorization.

125421929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 125421929 is about 11199.1932298715. The cubic root of 125421929 is about 500.5619402098.

The spelling of 125421929 in words is "one hundred twenty-five million, four hundred twenty-one thousand, nine hundred twenty-nine".