213571231 has 2 divisors, whose sum is σ = 213571232. Its totient is φ = 213571230.

The previous prime is 213571199. The next prime is 213571247. The reversal of 213571231 is 132175312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213571231 - 2⁵ = 213571199 is a prime.

It is a super-2 number, since 2×213571231² = 91225341421710722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213571196 and 213571205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213571271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106785615 + 106785616.

It is an arithmetic number, because the mean of its divisors is an integer number (106785616).

Almost surely, 2^213571231 is an apocalyptic number.

213571231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213571231 is an equidigital number, since it uses as much as digits as its factorization.

213571231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 213571231 is about 14614.0764675706. The cubic root of 213571231 is about 597.7426578090.

The spelling of 213571231 in words is "two hundred thirteen million, five hundred seventy-one thousand, two hundred thirty-one".