211243031 has 2 divisors, whose sum is σ = 211243032. Its totient is φ = 211243030.

The previous prime is 211242979. The next prime is 211243049. The reversal of 211243031 is 130342112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211243031 - 2²² = 207048727 is a prime.

It is a super-2 number, since 2×211243031² = 89247236292133922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211243631) 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, 105621515 + 105621516.

It is an arithmetic number, because the mean of its divisors is an integer number (105621516).

Almost surely, 2^211243031 is an apocalyptic number.

211243031 is a deficient number, since it is larger than the sum of its proper divisors (1).

211243031 is an equidigital number, since it uses as much as digits as its factorization.

211243031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 211243031 is about 14534.2021108831. The cubic root of 211243031 is about 595.5626633793.

Adding to 211243031 its reverse (130342112), we get a palindrome (341585143).

The spelling of 211243031 in words is "two hundred eleven million, two hundred forty-three thousand, thirty-one".