255843979 has 2 divisors, whose sum is σ = 255843980. Its totient is φ = 255843978.

The previous prime is 255843971. The next prime is 255844013. The reversal of 255843979 is 979348552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255843979 - 2³ = 255843971 is a prime.

It is a super-2 number, since 2×255843979² = 130912283181104882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (255843971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127921989 + 127921990.

It is an arithmetic number, because the mean of its divisors is an integer number (127921990).

Almost surely, 2^255843979 is an apocalyptic number.

255843979 is a deficient number, since it is larger than the sum of its proper divisors (1).

255843979 is an equidigital number, since it uses as much as digits as its factorization.

255843979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 52.

The square root of 255843979 is about 15995.1236006478. The cubic root of 255843979 is about 634.8314008754.

The spelling of 255843979 in words is "two hundred fifty-five million, eight hundred forty-three thousand, nine hundred seventy-nine".