631255261 has 32 divisors (see below), whose sum is σ = 815109120. Its totient is φ = 475497216.

The previous prime is 631255223. The next prime is 631255277. The reversal of 631255261 is 162552136.

It is a cyclic number.

It is not a de Polignac number, because 631255261 - 2⁷ = 631255133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631255291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156255 + ... + 160243.

It is an arithmetic number, because the mean of its divisors is an integer number (25472160).

Almost surely, 2^631255261 is an apocalyptic number.

It is an amenable number.

631255261 is a deficient number, since it is larger than the sum of its proper divisors (183853859).

631255261 is a wasteful number, since it uses less digits than its factorization.

631255261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093.

The product of its digits is 10800, while the sum is 31.

The square root of 631255261 is about 25124.7937503972. The cubic root of 631255261 is about 857.8308689254.

It can be divided in two parts, 63125 and 5261, that added together give a palindrome (68386).

The spelling of 631255261 in words is "six hundred thirty-one million, two hundred fifty-five thousand, two hundred sixty-one".