561337831 has 2 divisors, whose sum is σ = 561337832. Its totient is φ = 561337830.

The previous prime is 561337811. The next prime is 561337837. The reversal of 561337831 is 138733165.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561337831 - 2⁷ = 561337703 is a prime.

It is a super-2 number, since 2×561337831² = 630200321023569122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561337837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280668915 + 280668916.

It is an arithmetic number, because the mean of its divisors is an integer number (280668916).

Almost surely, 2^561337831 is an apocalyptic number.

561337831 is a deficient number, since it is larger than the sum of its proper divisors (1).

561337831 is an equidigital number, since it uses as much as digits as its factorization.

561337831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 561337831 is about 23692.5691093220. The cubic root of 561337831 is about 824.9129169178.

The spelling of 561337831 in words is "five hundred sixty-one million, three hundred thirty-seven thousand, eight hundred thirty-one".