255638441 has 2 divisors, whose sum is σ = 255638442. Its totient is φ = 255638440.

The previous prime is 255638419. The next prime is 255638447. The reversal of 255638441 is 144836552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149548441 + 106090000 = 12229^2 + 10300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255638441 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 255638395 and 255638404.

It is not a weakly prime, because it can be changed into another prime (255638447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127819220 + 127819221.

It is an arithmetic number, because the mean of its divisors is an integer number (127819221).

Almost surely, 2^255638441 is an apocalyptic number.

It is an amenable number.

255638441 is a deficient number, since it is larger than the sum of its proper divisors (1).

255638441 is an equidigital number, since it uses as much as digits as its factorization.

255638441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 38.

The square root of 255638441 is about 15988.6972890226. The cubic root of 255638441 is about 634.6613533143.

The spelling of 255638441 in words is "two hundred fifty-five million, six hundred thirty-eight thousand, four hundred forty-one".