31668031 has 4 divisors (see below), whose sum is σ = 32440464. Its totient is φ = 30895600.

The previous prime is 31668017. The next prime is 31668047. The reversal of 31668031 is 13086613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13086613 = 59 ⋅221807.

It is a cyclic number.

It is not a de Polignac number, because 31668031 - 2¹³ = 31659839 is a prime.

It is a super-2 number, since 2×31668031² = 2005728374833922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31668001) 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 in 3 ways as a sum of consecutive naturals, for example, 386155 + ... + 386236.

It is an arithmetic number, because the mean of its divisors is an integer number (8110116).

Almost surely, 2^31668031 is an apocalyptic number.

31668031 is a deficient number, since it is larger than the sum of its proper divisors (772433).

31668031 is an equidigital number, since it uses as much as digits as its factorization.

31668031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772432.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31668031 is about 5627.4355616035. The cubic root of 31668031 is about 316.3785421104.

The spelling of 31668031 in words is "thirty-one million, six hundred sixty-eight thousand, thirty-one".