561813437 has 2 divisors, whose sum is σ = 561813438. Its totient is φ = 561813436.

The previous prime is 561813401. The next prime is 561813449. The reversal of 561813437 is 734318165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535043161 + 26770276 = 23131^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 561813437 - 2¹² = 561809341 is a prime.

It is a super-3 number, since 3×561813437³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561813437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561812437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280906718 + 280906719.

It is an arithmetic number, because the mean of its divisors is an integer number (280906719).

Almost surely, 2^561813437 is an apocalyptic number.

It is an amenable number.

561813437 is a deficient number, since it is larger than the sum of its proper divisors (1).

561813437 is an equidigital number, since it uses as much as digits as its factorization.

561813437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 561813437 is about 23702.6040130615. The cubic root of 561813437 is about 825.1458264415.

The spelling of 561813437 in words is "five hundred sixty-one million, eight hundred thirteen thousand, four hundred thirty-seven".