561805025 has 6 divisors (see below), whose sum is σ = 696638262. Its totient is φ = 449444000.

The previous prime is 561804953. The next prime is 561805039. The reversal of 561805025 is 520508165.

It can be written as a sum of positive squares in 3 ways, for example, as 158558464 + 403246561 = 12592^2 + 20081^2 .

It is not a de Polignac number, because 561805025 - 2¹² = 561800929 is a prime.

It is a super-2 number, since 2×561805025² = 631249772230501250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 561804982 and 561805000.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11236076 + ... + 11236125.

It is an arithmetic number, because the mean of its divisors is an integer number (116106377).

Almost surely, 2^561805025 is an apocalyptic number.

It is an amenable number.

561805025 is a deficient number, since it is larger than the sum of its proper divisors (134833237).

561805025 is a wasteful number, since it uses less digits than its factorization.

561805025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22472211 (or 22472206 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 561805025 is about 23702.4265635399. The cubic root of 561805025 is about 825.1417081340.

It can be divided in two parts, 56 and 1805025, that added together give a palindrome (1805081).

The spelling of 561805025 in words is "five hundred sixty-one million, eight hundred five thousand, twenty-five".