213381791 has 8 divisors (see below), whose sum is σ = 246280224. Its totient is φ = 181087200.

The previous prime is 213381757. The next prime is 213381809. The reversal of 213381791 is 197183312.

It is a happy number.

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

It is not a de Polignac number, because 213381791 - 2²² = 209187487 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 (213381731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150200 + ... + 151613.

It is an arithmetic number, because the mean of its divisors is an integer number (30785028).

Almost surely, 2^213381791 is an apocalyptic number.

213381791 is a deficient number, since it is larger than the sum of its proper divisors (32898433).

213381791 is a wasteful number, since it uses less digits than its factorization.

213381791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301921.

The product of its digits is 9072, while the sum is 35.

The square root of 213381791 is about 14607.5936074358. The cubic root of 213381791 is about 597.5658707862.

The spelling of 213381791 in words is "two hundred thirteen million, three hundred eighty-one thousand, seven hundred ninety-one".