211197643 has 2 divisors, whose sum is σ = 211197644. Its totient is φ = 211197642.

The previous prime is 211197619. The next prime is 211197697. The reversal of 211197643 is 346791112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211197643 - 2⁵ = 211197611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211197599 and 211197608.

It is not a weakly prime, because it can be changed into another prime (211197043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105598821 + 105598822.

It is an arithmetic number, because the mean of its divisors is an integer number (105598822).

Almost surely, 2^211197643 is an apocalyptic number.

211197643 is a deficient number, since it is larger than the sum of its proper divisors (1).

211197643 is an equidigital number, since it uses as much as digits as its factorization.

211197643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 211197643 is about 14532.6406065794. The cubic root of 211197643 is about 595.5200058231.

The spelling of 211197643 in words is "two hundred eleven million, one hundred ninety-seven thousand, six hundred forty-three".