561020331 has 4 divisors (see below), whose sum is σ = 748027112. Its totient is φ = 374013552.

The previous prime is 561020303. The next prime is 561020333. The reversal of 561020331 is 133020165.

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

It is not a de Polignac number, because 561020331 - 2⁶ = 561020267 is a prime.

It is a super-2 number, since 2×561020331² = 629487623590699122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561020298 and 561020307.

It is not an unprimeable number, because it can be changed into a prime (561020333) 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, 93503386 + ... + 93503391.

It is an arithmetic number, because the mean of its divisors is an integer number (187006778).

Almost surely, 2^561020331 is an apocalyptic number.

561020331 is a deficient number, since it is larger than the sum of its proper divisors (187006781).

561020331 is a wasteful number, since it uses less digits than its factorization.

561020331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187006780.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 561020331 is about 23685.8677485120. The cubic root of 561020331 is about 824.7573604169.

Adding to 561020331 its reverse (133020165), we get a palindrome (694040496).

The spelling of 561020331 in words is "five hundred sixty-one million, twenty thousand, three hundred thirty-one".