561813401 has 2 divisors, whose sum is σ = 561813402. Its totient is φ = 561813400.

The previous prime is 561813391. The next prime is 561813437. The reversal of 561813401 is 104318165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523311376 + 38502025 = 22876^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 561813401 - 2²⁶ = 494704537 is a prime.

It is not a weakly prime, because it can be changed into another prime (561813001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280906700 + 280906701.

It is an arithmetic number, because the mean of its divisors is an integer number (280906701).

Almost surely, 2^561813401 is an apocalyptic number.

It is an amenable number.

561813401 is a deficient number, since it is larger than the sum of its proper divisors (1).

561813401 is an equidigital number, since it uses as much as digits as its factorization.

561813401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 561813401 is about 23702.6032536513. The cubic root of 561813401 is about 825.1458088168.

The spelling of 561813401 in words is "five hundred sixty-one million, eight hundred thirteen thousand, four hundred one".