425756021 has 2 divisors, whose sum is σ = 425756022. Its totient is φ = 425756020.

The previous prime is 425756017. The next prime is 425756039. The reversal of 425756021 is 120657524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424936996 + 819025 = 20614^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 425756021 - 2² = 425756017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425753021) 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, 212878010 + 212878011.

It is an arithmetic number, because the mean of its divisors is an integer number (212878011).

Almost surely, 2^425756021 is an apocalyptic number.

It is an amenable number.

425756021 is a deficient number, since it is larger than the sum of its proper divisors (1).

425756021 is an equidigital number, since it uses as much as digits as its factorization.

425756021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 425756021 is about 20633.8561834670. The cubic root of 425756021 is about 752.2928476197.

The spelling of 425756021 in words is "four hundred twenty-five million, seven hundred fifty-six thousand, twenty-one".