209934931 has 2 divisors, whose sum is σ = 209934932. Its totient is φ = 209934930.

The previous prime is 209934917. The next prime is 209934953. The reversal of 209934931 is 139439902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209934931 - 2⁹ = 209934419 is a prime.

It is a super-2 number, since 2×209934931² = 88145350507949522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209904931) 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, 104967465 + 104967466.

It is an arithmetic number, because the mean of its divisors is an integer number (104967466).

Almost surely, 2^209934931 is an apocalyptic number.

209934931 is a deficient number, since it is larger than the sum of its proper divisors (1).

209934931 is an equidigital number, since it uses as much as digits as its factorization.

209934931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 209934931 is about 14489.1314784565. The cubic root of 209934931 is about 594.3307976555.

The spelling of 209934931 in words is "two hundred nine million, nine hundred thirty-four thousand, nine hundred thirty-one".