213997171 has 4 divisors (see below), whose sum is σ = 225260200. Its totient is φ = 202734144.

The previous prime is 213997169. The next prime is 213997261. The reversal of 213997171 is 171799312.

213997171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213997171 - 2¹ = 213997169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213997141) 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, 5631486 + ... + 5631523.

It is an arithmetic number, because the mean of its divisors is an integer number (56315050).

Almost surely, 2^213997171 is an apocalyptic number.

213997171 is a deficient number, since it is larger than the sum of its proper divisors (11263029).

213997171 is a wasteful number, since it uses less digits than its factorization.

213997171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11263028.

The product of its digits is 23814, while the sum is 40.

The square root of 213997171 is about 14628.6421447789. The cubic root of 213997171 is about 598.1397672208.

The spelling of 213997171 in words is "two hundred thirteen million, nine hundred ninety-seven thousand, one hundred seventy-one".