213979133 has 4 divisors (see below), whose sum is σ = 216910428. Its totient is φ = 211047840.

The previous prime is 213979127. The next prime is 213979141. The reversal of 213979133 is 331979312.

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 82119844 + 131859289 = 9062^2 + 11483^2 .

It is a cyclic number.

It is not a de Polignac number, because 213979133 - 2¹⁶ = 213913597 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 (213979193) 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, 1465538 + ... + 1465683.

It is an arithmetic number, because the mean of its divisors is an integer number (54227607).

Almost surely, 2^213979133 is an apocalyptic number.

It is an amenable number.

213979133 is a deficient number, since it is larger than the sum of its proper divisors (2931295).

213979133 is an equidigital number, since it uses as much as digits as its factorization.

213979133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931294.

The product of its digits is 30618, while the sum is 38.

The square root of 213979133 is about 14628.0256015636. The cubic root of 213979133 is about 598.1229608487.

The spelling of 213979133 in words is "two hundred thirteen million, nine hundred seventy-nine thousand, one hundred thirty-three".