631140281 has 2 divisors, whose sum is σ = 631140282. Its totient is φ = 631140280.

The previous prime is 631140277. The next prime is 631140353. The reversal of 631140281 is 182041136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470890000 + 160250281 = 21700^2 + 12659^2 .

It is a cyclic number.

It is not a de Polignac number, because 631140281 - 2² = 631140277 is a prime.

It is a super-2 number, since 2×631140281² = 796676108601517922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 631140281.

It is not a weakly prime, because it can be changed into another prime (631140781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315570140 + 315570141.

It is an arithmetic number, because the mean of its divisors is an integer number (315570141).

Almost surely, 2^631140281 is an apocalyptic number.

It is an amenable number.

631140281 is a deficient number, since it is larger than the sum of its proper divisors (1).

631140281 is an equidigital number, since it uses as much as digits as its factorization.

631140281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 631140281 is about 25122.5054682052. The cubic root of 631140281 is about 857.7787825569.

The spelling of 631140281 in words is "six hundred thirty-one million, one hundred forty thousand, two hundred eighty-one".