631705069 has 2 divisors, whose sum is σ = 631705070. Its totient is φ = 631705068.

The previous prime is 631705021. The next prime is 631705079. The reversal of 631705069 is 960507136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437437225 + 194267844 = 20915^2 + 13938^2 .

It is a cyclic number.

It is not a de Polignac number, because 631705069 - 2²¹ = 629607917 is a prime.

It is a super-2 number, since 2×631705069² = 798102588400589522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631705079) 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, 315852534 + 315852535.

It is an arithmetic number, because the mean of its divisors is an integer number (315852535).

Almost surely, 2^631705069 is an apocalyptic number.

It is an amenable number.

631705069 is a deficient number, since it is larger than the sum of its proper divisors (1).

631705069 is an equidigital number, since it uses as much as digits as its factorization.

631705069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 631705069 is about 25133.7436328136. The cubic root of 631705069 is about 858.0345728775.

The spelling of 631705069 in words is "six hundred thirty-one million, seven hundred five thousand, sixty-nine".