561382631 has 2 divisors, whose sum is σ = 561382632. Its totient is φ = 561382630.

The previous prime is 561382603. The next prime is 561382637. The reversal of 561382631 is 136283165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561382631 - 2⁶ = 561382567 is a prime.

It is a super-2 number, since 2×561382631² = 630300916776964322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561382591 and 561382600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561382637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280691315 + 280691316.

It is an arithmetic number, because the mean of its divisors is an integer number (280691316).

Almost surely, 2^561382631 is an apocalyptic number.

561382631 is a deficient number, since it is larger than the sum of its proper divisors (1).

561382631 is an equidigital number, since it uses as much as digits as its factorization.

561382631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 561382631 is about 23693.5145345725. The cubic root of 561382631 is about 824.9348615850.

The spelling of 561382631 in words is "five hundred sixty-one million, three hundred eighty-two thousand, six hundred thirty-one".