31983949 has 2 divisors, whose sum is σ = 31983950. Its totient is φ = 31983948.

The previous prime is 31983937. The next prime is 31983983. The reversal of 31983949 is 94938913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20994724 + 10989225 = 4582^2 + 3315^2 .

It is an emirp because it is prime and its reverse (94938913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31983949 - 2¹⁹ = 31459661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31983899 and 31983908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31983929) 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, 15991974 + 15991975.

It is an arithmetic number, because the mean of its divisors is an integer number (15991975).

Almost surely, 2^31983949 is an apocalyptic number.

It is an amenable number.

31983949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31983949 is an equidigital number, since it uses as much as digits as its factorization.

31983949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 31983949 is about 5655.4353501742. The cubic root of 31983949 is about 317.4271194862.

The spelling of 31983949 in words is "thirty-one million, nine hundred eighty-three thousand, nine hundred forty-nine".