213884231581 has 8 divisors (see below), whose sum is σ = 215444275200. Its totient is φ = 212324492640.

The previous prime is 213884231563. The next prime is 213884231593. The reversal of 213884231581 is 185132488312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 213884231581 - 2²¹ = 213882134429 is a prime.

It is a super-2 number, since 2×213884231581² (a number of 23 digits) 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 (213884231501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442916 + ... + 1584226.

It is an arithmetic number, because the mean of its divisors is an integer number (26930534400).

Almost surely, 2^213884231581 is an apocalyptic number.

It is an amenable number.

213884231581 is a deficient number, since it is larger than the sum of its proper divisors (1560043619).

213884231581 is a wasteful number, since it uses less digits than its factorization.

213884231581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152339.

The product of its digits is 368640, while the sum is 46.

The spelling of 213884231581 in words is "two hundred thirteen billion, eight hundred eighty-four million, two hundred thirty-one thousand, five hundred eighty-one".