213279197 has 4 divisors (see below), whose sum is σ = 214049436. Its totient is φ = 212508960.

The previous prime is 213279181. The next prime is 213279217. The reversal of 213279197 is 791972312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 53787556 + 159491641 = 7334^2 + 12629^2 .

It is a cyclic number.

It is not a de Polignac number, because 213279197 - 2⁴ = 213279181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213279167) 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, 384704 + ... + 385257.

It is an arithmetic number, because the mean of its divisors is an integer number (53512359).

Almost surely, 2^213279197 is an apocalyptic number.

It is an amenable number.

213279197 is a deficient number, since it is larger than the sum of its proper divisors (770239).

213279197 is an equidigital number, since it uses as much as digits as its factorization.

213279197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770238.

The product of its digits is 47628, while the sum is 41.

The square root of 213279197 is about 14604.0815185345. The cubic root of 213279197 is about 597.4700855106.

The spelling of 213279197 in words is "two hundred thirteen million, two hundred seventy-nine thousand, one hundred ninety-seven".