213516231 has 4 divisors (see below), whose sum is σ = 284688312. Its totient is φ = 142344152.

The previous prime is 213516229. The next prime is 213516239. The reversal of 213516231 is 132615312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213516231 - 2¹ = 213516229 is a prime.

It is a super-2 number, since 2×213516231² = 91178361800890722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213516239) 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, 35586036 + ... + 35586041.

It is an arithmetic number, because the mean of its divisors is an integer number (71172078).

Almost surely, 2^213516231 is an apocalyptic number.

213516231 is a deficient number, since it is larger than the sum of its proper divisors (71172081).

213516231 is an equidigital number, since it uses as much as digits as its factorization.

213516231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71172080.

The product of its digits is 1080, while the sum is 24.

The square root of 213516231 is about 14612.1945990327. The cubic root of 213516231 is about 597.6913421136.

The spelling of 213516231 in words is "two hundred thirteen million, five hundred sixteen thousand, two hundred thirty-one".