31662361 has 2 divisors, whose sum is σ = 31662362. Its totient is φ = 31662360.

The previous prime is 31662289. The next prime is 31662413. The reversal of 31662361 is 16326613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 2975625 = 5356^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 31662361 - 2⁹ = 31661849 is a prime.

It is not a weakly prime, because it can be changed into another prime (31668361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831180 + 15831181.

It is an arithmetic number, because the mean of its divisors is an integer number (15831181).

Almost surely, 2^31662361 is an apocalyptic number.

It is an amenable number.

31662361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31662361 is an equidigital number, since it uses as much as digits as its factorization.

31662361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 31662361 is about 5626.9317571835. The cubic root of 31662361 is about 316.3596589934.

Adding to 31662361 its reverse (16326613), we get a palindrome (47988974).

It can be divided in two parts, 31662 and 361, that added together give a palindrome (32023).

The spelling of 31662361 in words is "thirty-one million, six hundred sixty-two thousand, three hundred sixty-one".