631380255 has 128 divisors (see below), whose sum is σ = 1236197376. Its totient is φ = 271564800.

The previous prime is 631380229. The next prime is 631380259. The reversal of 631380255 is 552083136.

It is not a de Polignac number, because 631380255 - 2¹² = 631376159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631380259) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4608547 + ... + 4608683.

It is an arithmetic number, because the mean of its divisors is an integer number (9657792).

Almost surely, 2^631380255 is an apocalyptic number.

631380255 is a deficient number, since it is larger than the sum of its proper divisors (604817121).

631380255 is a wasteful number, since it uses less digits than its factorization.

631380255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 631380255 is about 25127.2810904801. The cubic root of 631380255 is about 857.8874844986.

It can be divided in two parts, 6313 and 80255, that added together give a palindrome (86568).

The spelling of 631380255 in words is "six hundred thirty-one million, three hundred eighty thousand, two hundred fifty-five".