561522420 has 36 divisors (see below), whose sum is σ = 1703285220. Its totient is φ = 149739264.

The previous prime is 561522419. The next prime is 561522421. The reversal of 561522420 is 24225165.

561522420 is a `hidden beast` number, since 5 + 615 + 2 + 2 + 42 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (561522419) and next prime (561522421).

It can be written as a sum of positive squares in 2 ways, for example, as 358117776 + 203404644 = 18924^2 + 14262^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561522421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1559605 + ... + 1559964.

Almost surely, 2^561522420 is an apocalyptic number.

It is an amenable number.

561522420 is an abundant number, since it is smaller than the sum of its proper divisors (1141762800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561522420 is a wasteful number, since it uses less digits than its factorization.

561522420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119584 (or 3119579 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 561522420 is about 23696.4642932232. The cubic root of 561522420 is about 825.0033278103.

Adding to 561522420 its reverse (24225165), we get a palindrome (585747585).

The spelling of 561522420 in words is "five hundred sixty-one million, five hundred twenty-two thousand, four hundred twenty".