425399861 has 2 divisors, whose sum is σ = 425399862. Its totient is φ = 425399860.

The previous prime is 425399851. The next prime is 425399941. The reversal of 425399861 is 168993524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272877361 + 152522500 = 16519^2 + 12350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425399861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425399831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212699930 + 212699931.

It is an arithmetic number, because the mean of its divisors is an integer number (212699931).

Almost surely, 2^425399861 is an apocalyptic number.

It is an amenable number.

425399861 is a deficient number, since it is larger than the sum of its proper divisors (1).

425399861 is an equidigital number, since it uses as much as digits as its factorization.

425399861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The square root of 425399861 is about 20625.2239018150. The cubic root of 425399861 is about 752.0830158890.

The spelling of 425399861 in words is "four hundred twenty-five million, three hundred ninety-nine thousand, eight hundred sixty-one".