255404401 has 4 divisors (see below), whose sum is σ = 291890752. Its totient is φ = 218918052.

The previous prime is 255404389. The next prime is 255404417. The reversal of 255404401 is 104404552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255404401 - 2⁷ = 255404273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255404431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18243165 + ... + 18243178.

It is an arithmetic number, because the mean of its divisors is an integer number (72972688).

Almost surely, 2^255404401 is an apocalyptic number.

It is an amenable number.

255404401 is a deficient number, since it is larger than the sum of its proper divisors (36486351).

255404401 is an equidigital number, since it uses as much as digits as its factorization.

255404401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36486350.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 255404401 is about 15981.3766928885. The cubic root of 255404401 is about 634.4676142004.

Adding to 255404401 its reverse (104404552), we get a palindrome (359808953).

The spelling of 255404401 in words is "two hundred fifty-five million, four hundred four thousand, four hundred one".