425681 has 2 divisors, whose sum is σ = 425682. Its totient is φ = 425680.

The previous prime is 425653. The next prime is 425701. The reversal of 425681 is 186524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379456 + 46225 = 616^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425681 is a prime.

It is a super-2 number, since 2×425681² = 362408627522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 425681.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 425681.

It is not a weakly prime, because it can be changed into another prime (425641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212840 + 212841.

It is an arithmetic number, because the mean of its divisors is an integer number (212841).

2⁴²⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

425681 is a deficient number, since it is larger than the sum of its proper divisors (1).

425681 is an equidigital number, since it uses as much as digits as its factorization.

425681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 425681 is about 652.4423346166. The cubic root of 425681 is about 75.2248658715.

The spelling of 425681 in words is "four hundred twenty-five thousand, six hundred eighty-one".