631628717 has 2 divisors, whose sum is σ = 631628718. Its totient is φ = 631628716.

The previous prime is 631628707. The next prime is 631628743. The reversal of 631628717 is 717826136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481100356 + 150528361 = 21934^2 + 12269^2 .

It is a cyclic number.

It is not a de Polignac number, because 631628717 - 2¹² = 631624621 is a prime.

It is a super-2 number, since 2×631628717² = 797909672278132178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631628707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315814358 + 315814359.

It is an arithmetic number, because the mean of its divisors is an integer number (315814359).

Almost surely, 2^631628717 is an apocalyptic number.

It is an amenable number.

631628717 is a deficient number, since it is larger than the sum of its proper divisors (1).

631628717 is an equidigital number, since it uses as much as digits as its factorization.

631628717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 631628717 is about 25132.2246727185. The cubic root of 631628717 is about 858.0000022640. Note that the first 5 decimals are identical.

The spelling of 631628717 in words is "six hundred thirty-one million, six hundred twenty-eight thousand, seven hundred seventeen".