425644129 has 2 divisors, whose sum is σ = 425644130. Its totient is φ = 425644128.

The previous prime is 425644127. The next prime is 425644151. The reversal of 425644129 is 921446524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355888225 + 69755904 = 18865^2 + 8352^2 .

It is a cyclic number.

It is not a de Polignac number, because 425644129 - 2¹ = 425644127 is a prime.

Together with 425644127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (425644123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212822064 + 212822065.

It is an arithmetic number, because the mean of its divisors is an integer number (212822065).

Almost surely, 2^425644129 is an apocalyptic number.

It is an amenable number.

425644129 is a deficient number, since it is larger than the sum of its proper divisors (1).

425644129 is an equidigital number, since it uses as much as digits as its factorization.

425644129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The square root of 425644129 is about 20631.1446362047. The cubic root of 425644129 is about 752.2269390380.

The spelling of 425644129 in words is "four hundred twenty-five million, six hundred forty-four thousand, one hundred twenty-nine".