255121638 has 8 divisors (see below), whose sum is σ = 510243288. Its totient is φ = 85040544.

The previous prime is 255121637. The next prime is 255121649. The reversal of 255121638 is 836121552.

255121638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

255121638 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 255121599 and 255121608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255121631) 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, 21260131 + ... + 21260142.

It is an arithmetic number, because the mean of its divisors is an integer number (63780411).

Almost surely, 2^255121638 is an apocalyptic number.

255121638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255121638 is a wasteful number, since it uses less digits than its factorization.

255121638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42520278.

The product of its digits is 14400, while the sum is 33.

The square root of 255121638 is about 15972.5276021048. The cubic root of 255121638 is about 634.2333840760.

The spelling of 255121638 in words is "two hundred fifty-five million, one hundred twenty-one thousand, six hundred thirty-eight".