561949723 has 2 divisors, whose sum is σ = 561949724. Its totient is φ = 561949722.

The previous prime is 561949721. The next prime is 561949753. The reversal of 561949723 is 327949165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561949723 - 2¹ = 561949721 is a prime.

Together with 561949721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (561949721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280974861 + 280974862.

It is an arithmetic number, because the mean of its divisors is an integer number (280974862).

Almost surely, 2^561949723 is an apocalyptic number.

561949723 is a deficient number, since it is larger than the sum of its proper divisors (1).

561949723 is an equidigital number, since it uses as much as digits as its factorization.

561949723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The square root of 561949723 is about 23705.4787549208. The cubic root of 561949723 is about 825.2125429732.

The spelling of 561949723 in words is "five hundred sixty-one million, nine hundred forty-nine thousand, seven hundred twenty-three".