5561999 has 2 divisors, whose sum is σ = 5562000. Its totient is φ = 5561998.

The previous prime is 5561993. The next prime is 5562047. The reversal of 5561999 is 9991655.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5561999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780999 + 2781000.

It is an arithmetic number, because the mean of its divisors is an integer number (2781000).

Almost surely, 2^5561999 is an apocalyptic number.

5561999 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561999 is an equidigital number, since it uses as much as digits as its factorization.

5561999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 44.

The square root of 5561999 is about 2358.3890688349. The cubic root of 5561999 is about 177.1782068904.

The spelling of 5561999 in words is "five million, five hundred sixty-one thousand, nine hundred ninety-nine".