31668881 has 2 divisors, whose sum is σ = 31668882. Its totient is φ = 31668880.

The previous prime is 31668869. The next prime is 31668893. The reversal of 31668881 is 18886613.

It is a balanced prime because it is at equal distance from previous prime (31668869) and next prime (31668893).

It can be written as a sum of positive squares in only one way, i.e., 31259281 + 409600 = 5591^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 31668881 - 2⁶ = 31668817 is a prime.

It is a super-2 number, since 2×31668881² = 2005836047584322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31668811) 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, 15834440 + 15834441.

It is an arithmetic number, because the mean of its divisors is an integer number (15834441).

Almost surely, 2^31668881 is an apocalyptic number.

It is an amenable number.

31668881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31668881 is an equidigital number, since it uses as much as digits as its factorization.

31668881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 31668881 is about 5627.5110839518. The cubic root of 31668881 is about 316.3813727185.

The spelling of 31668881 in words is "thirty-one million, six hundred sixty-eight thousand, eight hundred eighty-one".