31481867 has 2 divisors, whose sum is σ = 31481868. Its totient is φ = 31481866.

The previous prime is 31481851. The next prime is 31481887. The reversal of 31481867 is 76818413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31481867 - 2⁴ = 31481851 is a prime.

It is a super-2 number, since 2×31481867² = 1982215899611378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31481867.

It is not a weakly prime, because it can be changed into another prime (31481837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740933 + 15740934.

It is an arithmetic number, because the mean of its divisors is an integer number (15740934).

Almost surely, 2^31481867 is an apocalyptic number.

31481867 is a deficient number, since it is larger than the sum of its proper divisors (1).

31481867 is an equidigital number, since it uses as much as digits as its factorization.

31481867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 31481867 is about 5610.8704315819. The cubic root of 31481867 is about 315.7573679606.

The spelling of 31481867 in words is "thirty-one million, four hundred eighty-one thousand, eight hundred sixty-seven".