31536361 has 2 divisors, whose sum is σ = 31536362. Its totient is φ = 31536360.

The previous prime is 31536359. The next prime is 31536383. The reversal of 31536361 is 16363513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 9960336 = 4645^2 + 3156^2 .

It is an emirp because it is prime and its reverse (16363513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31536361 - 2¹ = 31536359 is a prime.

Together with 31536359, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31536391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15768180 + 15768181.

It is an arithmetic number, because the mean of its divisors is an integer number (15768181).

Almost surely, 2^31536361 is an apocalyptic number.

It is an amenable number.

31536361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31536361 is an equidigital number, since it uses as much as digits as its factorization.

31536361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 28.

The square root of 31536361 is about 5615.7244412453. The cubic root of 31536361 is about 315.9394512255.

Adding to 31536361 its reverse (16363513), we get a palindrome (47899874).

The spelling of 31536361 in words is "thirty-one million, five hundred thirty-six thousand, three hundred sixty-one".