213859381 has 4 divisors (see below), whose sum is σ = 214317792. Its totient is φ = 213400972.

The previous prime is 213859367. The next prime is 213859391. The reversal of 213859381 is 183958312.

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 213859381 - 2¹¹ = 213857333 is a prime.

It is a super-2 number, since 2×213859381² = 91471669683406322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213859361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228505 + ... + 229438.

It is an arithmetic number, because the mean of its divisors is an integer number (53579448).

Almost surely, 2^213859381 is an apocalyptic number.

It is an amenable number.

213859381 is a deficient number, since it is larger than the sum of its proper divisors (458411).

213859381 is an equidigital number, since it uses as much as digits as its factorization.

213859381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458410.

The product of its digits is 51840, while the sum is 40.

The square root of 213859381 is about 14623.9317900488. The cubic root of 213859381 is about 598.0113615139.

The spelling of 213859381 in words is "two hundred thirteen million, eight hundred fifty-nine thousand, three hundred eighty-one".