211230997 has 2 divisors, whose sum is σ = 211230998. Its totient is φ = 211230996.

The previous prime is 211230979. The next prime is 211231049. The reversal of 211230997 is 799032112.

It is a happy number.

Together with previous prime (211230979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193599396 + 17631601 = 13914^2 + 4199^2 .

It is a cyclic number.

It is not a de Polignac number, because 211230997 - 2¹¹ = 211228949 is a prime.

It is a super-2 number, since 2×211230997² = 89237068187228018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211230937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615498 + 105615499.

It is an arithmetic number, because the mean of its divisors is an integer number (105615499).

Almost surely, 2^211230997 is an apocalyptic number.

It is an amenable number.

211230997 is a deficient number, since it is larger than the sum of its proper divisors (1).

211230997 is an equidigital number, since it uses as much as digits as its factorization.

211230997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 211230997 is about 14533.7881159731. The cubic root of 211230997 is about 595.5513539140.

The spelling of 211230997 in words is "two hundred eleven million, two hundred thirty thousand, nine hundred ninety-seven".