211967897 has 4 divisors (see below), whose sum is σ = 212114640. Its totient is φ = 211821156.

The previous prime is 211967891. The next prime is 211967939. The reversal of 211967897 is 798769112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211967897 - 2⁴ = 211967881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211967891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71183 + ... + 74100.

It is an arithmetic number, because the mean of its divisors is an integer number (53028660).

Almost surely, 2^211967897 is an apocalyptic number.

It is an amenable number.

211967897 is a deficient number, since it is larger than the sum of its proper divisors (146743).

211967897 is a wasteful number, since it uses less digits than its factorization.

211967897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146742.

The product of its digits is 381024, while the sum is 50.

The square root of 211967897 is about 14559.1173152770. The cubic root of 211967897 is about 596.2430965217.

The spelling of 211967897 in words is "two hundred eleven million, nine hundred sixty-seven thousand, eight hundred ninety-seven".