31323641 has 2 divisors, whose sum is σ = 31323642. Its totient is φ = 31323640.

The previous prime is 31323637. The next prime is 31323703. The reversal of 31323641 is 14632313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29474041 + 1849600 = 5429^2 + 1360^2 .

It is an emirp because it is prime and its reverse (14632313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31323641 - 2² = 31323637 is a prime.

It is not a weakly prime, because it can be changed into another prime (31323841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661820 + 15661821.

It is an arithmetic number, because the mean of its divisors is an integer number (15661821).

Almost surely, 2^31323641 is an apocalyptic number.

It is an amenable number.

31323641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323641 is an equidigital number, since it uses as much as digits as its factorization.

31323641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 31323641 is about 5596.7527192114. The cubic root of 31323641 is about 315.2274866358.

Adding to 31323641 its reverse (14632313), we get a palindrome (45955954).

The spelling of 31323641 in words is "thirty-one million, three hundred twenty-three thousand, six hundred forty-one".