561004031 has 4 divisors (see below), whose sum is σ = 641147472. Its totient is φ = 480860592.

The previous prime is 561004001. The next prime is 561004039. The reversal of 561004031 is 130400165.

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

It is a cyclic number.

It is not a de Polignac number, because 561004031 - 2⁶ = 561003967 is a prime.

It is a super-2 number, since 2×561004031² = 629451045596497922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561003994 and 561004012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561004039) 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, 40071710 + ... + 40071723.

It is an arithmetic number, because the mean of its divisors is an integer number (160286868).

Almost surely, 2^561004031 is an apocalyptic number.

561004031 is a deficient number, since it is larger than the sum of its proper divisors (80143441).

561004031 is an equidigital number, since it uses as much as digits as its factorization.

561004031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80143440.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 561004031 is about 23685.5236589779. The cubic root of 561004031 is about 824.7493727829.

Adding to 561004031 its reverse (130400165), we get a palindrome (691404196).

The spelling of 561004031 in words is "five hundred sixty-one million, four thousand, thirty-one".