255561443 has 2 divisors, whose sum is σ = 255561444. Its totient is φ = 255561442.

The previous prime is 255561433. The next prime is 255561463. The reversal of 255561443 is 344165552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255561443 is a prime.

It is a super-2 number, since 2×255561443² = 130623302296484498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (255561403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127780721 + 127780722.

It is an arithmetic number, because the mean of its divisors is an integer number (127780722).

Almost surely, 2^255561443 is an apocalyptic number.

255561443 is a deficient number, since it is larger than the sum of its proper divisors (1).

255561443 is an equidigital number, since it uses as much as digits as its factorization.

255561443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 35.

The square root of 255561443 is about 15986.2892192028. The cubic root of 255561443 is about 634.5976271628.

The spelling of 255561443 in words is "two hundred fifty-five million, five hundred sixty-one thousand, four hundred forty-three".