425825581 has 2 divisors, whose sum is σ = 425825582. Its totient is φ = 425825580.

The previous prime is 425825557. The next prime is 425825599. The reversal of 425825581 is 185528524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225150025 + 200675556 = 15005^2 + 14166^2 .

It is a cyclic number.

It is not a de Polignac number, because 425825581 - 2⁷ = 425825453 is a prime.

It is a super-2 number, since 2×425825581² = 362654850867975122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425825681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212912790 + 212912791.

It is an arithmetic number, because the mean of its divisors is an integer number (212912791).

Almost surely, 2^425825581 is an apocalyptic number.

It is an amenable number.

425825581 is a deficient number, since it is larger than the sum of its proper divisors (1).

425825581 is an equidigital number, since it uses as much as digits as its factorization.

425825581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128000, while the sum is 40.

The square root of 425825581 is about 20635.5416938834. The cubic root of 425825581 is about 752.3338152461. Note that the first 3 decimals are identical.

The spelling of 425825581 in words is "four hundred twenty-five million, eight hundred twenty-five thousand, five hundred eighty-one".