210031993 has 2 divisors, whose sum is σ = 210031994. Its totient is φ = 210031992.

The previous prime is 210031981. The next prime is 210032029. The reversal of 210031993 is 399130012.

210031993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138933369 + 71098624 = 11787^2 + 8432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210031993 is a prime.

It is a super-2 number, since 2×210031993² = 88226876167104098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210031933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105015996 + 105015997.

It is an arithmetic number, because the mean of its divisors is an integer number (105015997).

Almost surely, 2^210031993 is an apocalyptic number.

It is an amenable number.

210031993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210031993 is an equidigital number, since it uses as much as digits as its factorization.

210031993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 210031993 is about 14492.4805675219. The cubic root of 210031993 is about 594.4223784888.

The spelling of 210031993 in words is "two hundred ten million, thirty-one thousand, nine hundred ninety-three".