631688273 has 2 divisors, whose sum is σ = 631688274. Its totient is φ = 631688272.

The previous prime is 631688249. The next prime is 631688327. The reversal of 631688273 is 372886136.

Together with next prime (631688327) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522213904 + 109474369 = 22852^2 + 10463^2 .

It is a cyclic number.

It is not a de Polignac number, because 631688273 - 2¹⁴ = 631671889 is a prime.

It is not a weakly prime, because it can be changed into another prime (631688243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315844136 + 315844137.

It is an arithmetic number, because the mean of its divisors is an integer number (315844137).

Almost surely, 2^631688273 is an apocalyptic number.

It is an amenable number.

631688273 is a deficient number, since it is larger than the sum of its proper divisors (1).

631688273 is an equidigital number, since it uses as much as digits as its factorization.

631688273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 631688273 is about 25133.4094981162. The cubic root of 631688273 is about 858.0269682335.

The spelling of 631688273 in words is "six hundred thirty-one million, six hundred eighty-eight thousand, two hundred seventy-three".