213985581 has 8 divisors (see below), whose sum is σ = 300330720. Its totient is φ = 135148752.

The previous prime is 213985571. The next prime is 213985609. The reversal of 213985581 is 185589312.

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

It is not a de Polignac number, because 213985581 - 2¹³ = 213977389 is a prime.

It is a super-2 number, since 2×213985581² = 91579657751815122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213985561) 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, 1877010 + ... + 1877123.

It is an arithmetic number, because the mean of its divisors is an integer number (37541340).

Almost surely, 2^213985581 is an apocalyptic number.

It is an amenable number.

213985581 is a deficient number, since it is larger than the sum of its proper divisors (86345139).

213985581 is a wasteful number, since it uses less digits than its factorization.

213985581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754155.

The product of its digits is 86400, while the sum is 42.

The square root of 213985581 is about 14628.2459987519. The cubic root of 213985581 is about 598.1289686901.

The spelling of 213985581 in words is "two hundred thirteen million, nine hundred eighty-five thousand, five hundred eighty-one".