255674821 has 2 divisors, whose sum is σ = 255674822. Its totient is φ = 255674820.

The previous prime is 255674807. The next prime is 255674827. The reversal of 255674821 is 128476552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249197796 + 6477025 = 15786^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 255674821 - 2¹³ = 255666629 is a prime.

It is a super-2 number, since 2×255674821² = 130739228186764082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255674827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127837410 + 127837411.

It is an arithmetic number, because the mean of its divisors is an integer number (127837411).

Almost surely, 2^255674821 is an apocalyptic number.

It is an amenable number.

255674821 is a deficient number, since it is larger than the sum of its proper divisors (1).

255674821 is an equidigital number, since it uses as much as digits as its factorization.

255674821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 40.

The square root of 255674821 is about 15989.8349272280. The cubic root of 255674821 is about 634.6914581826.

It can be divided in two parts, 2556 and 74821, that added together give a palindrome (77377).

The spelling of 255674821 in words is "two hundred fifty-five million, six hundred seventy-four thousand, eight hundred twenty-one".