425581561 has 2 divisors, whose sum is σ = 425581562. Its totient is φ = 425581560.

The previous prime is 425581543. The next prime is 425581591. The reversal of 425581561 is 165185524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266342400 + 159239161 = 16320^2 + 12619^2 .

It is a cyclic number.

It is not a de Polignac number, because 425581561 - 2⁹ = 425581049 is a prime.

It is a super-2 number, since 2×425581561² = 362239330126393442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 425581561.

It is not a weakly prime, because it can be changed into another prime (425581501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212790780 + 212790781.

It is an arithmetic number, because the mean of its divisors is an integer number (212790781).

Almost surely, 2^425581561 is an apocalyptic number.

It is an amenable number.

425581561 is a deficient number, since it is larger than the sum of its proper divisors (1).

425581561 is an equidigital number, since it uses as much as digits as its factorization.

425581561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48000, while the sum is 37.

The square root of 425581561 is about 20629.6282322295. The cubic root of 425581561 is about 752.1900791057.

The spelling of 425581561 in words is "four hundred twenty-five million, five hundred eighty-one thousand, five hundred sixty-one".