561626437 has 2 divisors, whose sum is σ = 561626438. Its totient is φ = 561626436.

The previous prime is 561626423. The next prime is 561626477. The reversal of 561626437 is 734626165.

It is an a-pointer prime, because the next prime (561626477) can be obtained adding 561626437 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503957601 + 57668836 = 22449^2 + 7594^2 .

It is a cyclic number.

It is not a de Polignac number, because 561626437 - 2¹¹ = 561624389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561626437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561626477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280813218 + 280813219.

It is an arithmetic number, because the mean of its divisors is an integer number (280813219).

Almost surely, 2^561626437 is an apocalyptic number.

It is an amenable number.

561626437 is a deficient number, since it is larger than the sum of its proper divisors (1).

561626437 is an equidigital number, since it uses as much as digits as its factorization.

561626437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 561626437 is about 23698.6589704987. The cubic root of 561626437 is about 825.0542661580.

The spelling of 561626437 in words is "five hundred sixty-one million, six hundred twenty-six thousand, four hundred thirty-seven".