425561 has 4 divisors (see below), whose sum is σ = 450612. Its totient is φ = 400512.

The previous prime is 425549. The next prime is 425563. The reversal of 425561 is 165524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175561 + 250000 = 419^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 425561 - 2¹⁰ = 424537 is a prime.

It is a super-2 number, since 2×425561² = 362204329442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12500 + ... + 12533.

It is an arithmetic number, because the mean of its divisors is an integer number (112653).

2⁴²⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

425561 is a deficient number, since it is larger than the sum of its proper divisors (25051).

425561 is a wasteful number, since it uses less digits than its factorization.

425561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25050.

The product of its digits is 1200, while the sum is 23.

The square root of 425561 is about 652.3503659844. The cubic root of 425561 is about 75.2177965463.

The spelling of 425561 in words is "four hundred twenty-five thousand, five hundred sixty-one".