213997911 has 8 divisors (see below), whose sum is σ = 297736320. Its totient is φ = 136462392.

The previous prime is 213997907. The next prime is 213997939. The reversal of 213997911 is 119799312.

213997911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213997911 - 2² = 213997907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213997951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1550641 + ... + 1550778.

It is an arithmetic number, because the mean of its divisors is an integer number (37217040).

Almost surely, 2^213997911 is an apocalyptic number.

213997911 is a deficient number, since it is larger than the sum of its proper divisors (83738409).

213997911 is a wasteful number, since it uses less digits than its factorization.

213997911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101445.

The product of its digits is 30618, while the sum is 42.

The square root of 213997911 is about 14628.6674376035. The cubic root of 213997911 is about 598.1404566737.

The spelling of 213997911 in words is "two hundred thirteen million, nine hundred ninety-seven thousand, nine hundred eleven".