31662013 has 2 divisors, whose sum is σ = 31662014. Its totient is φ = 31662012.

The previous prime is 31661983. The next prime is 31662019. The reversal of 31662013 is 31026613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 14538969 = 4138^2 + 3813^2 .

It is a cyclic number.

It is not a de Polignac number, because 31662013 - 2²¹ = 29564861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31662019) 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, 15831006 + 15831007.

It is an arithmetic number, because the mean of its divisors is an integer number (15831007).

Almost surely, 2^31662013 is an apocalyptic number.

It is an amenable number.

31662013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31662013 is an equidigital number, since it uses as much as digits as its factorization.

31662013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 31662013 is about 5626.9008343848. The cubic root of 31662013 is about 316.3584999561.

Adding to 31662013 its reverse (31026613), we get a palindrome (62688626).

The spelling of 31662013 in words is "thirty-one million, six hundred sixty-two thousand, thirteen".