561738943 has 2 divisors, whose sum is σ = 561738944. Its totient is φ = 561738942.

The previous prime is 561738929. The next prime is 561738949. The reversal of 561738943 is 349837165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561738943 - 2⁵ = 561738911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561738893 and 561738902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561738949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280869471 + 280869472.

It is an arithmetic number, because the mean of its divisors is an integer number (280869472).

Almost surely, 2^561738943 is an apocalyptic number.

561738943 is a deficient number, since it is larger than the sum of its proper divisors (1).

561738943 is an equidigital number, since it uses as much as digits as its factorization.

561738943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 561738943 is about 23701.0325302507. The cubic root of 561738943 is about 825.1093545891.

The spelling of 561738943 in words is "five hundred sixty-one million, seven hundred thirty-eight thousand, nine hundred forty-three".