255221401 has 4 divisors (see below), whose sum is σ = 255255652. Its totient is φ = 255187152.

The previous prime is 255221387. The next prime is 255221413. The reversal of 255221401 is 104122552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 68079001 + 187142400 = 8251^2 + 13680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255221401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255221441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690 + ... + 22603.

It is an arithmetic number, because the mean of its divisors is an integer number (63813913).

Almost surely, 2^255221401 is an apocalyptic number.

It is an amenable number.

255221401 is a deficient number, since it is larger than the sum of its proper divisors (34251).

255221401 is a wasteful number, since it uses less digits than its factorization.

255221401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34250.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 255221401 is about 15975.6502528066. The cubic root of 255221401 is about 634.3160437044.

Adding to 255221401 its reverse (104122552), we get a palindrome (359343953).

The spelling of 255221401 in words is "two hundred fifty-five million, two hundred twenty-one thousand, four hundred one".