631361 has 2 divisors, whose sum is σ = 631362. Its totient is φ = 631360.

The previous prime is 631357. The next prime is 631387. The reversal of 631361 is 163136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 40000 = 769^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 631361 - 2² = 631357 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631361.

It is not a weakly prime, because it can be changed into another prime (631391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315680 + 315681.

It is an arithmetic number, because the mean of its divisors is an integer number (315681).

2⁶³¹³⁶¹ is an apocalyptic number.

It is an amenable number.

631361 is a deficient number, since it is larger than the sum of its proper divisors (1).

631361 is an equidigital number, since it uses as much as digits as its factorization.

631361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 20.

The square root of 631361 is about 794.5822801951. The cubic root of 631361 is about 85.7878763504.

Adding to 631361 its reverse (163136), we get a palindrome (794497).

The spelling of 631361 in words is "six hundred thirty-one thousand, three hundred sixty-one".