213887831 has 2 divisors, whose sum is σ = 213887832. Its totient is φ = 213887830.

The previous prime is 213887819. The next prime is 213887873. The reversal of 213887831 is 138788312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213887831 - 2⁶ = 213887767 is a prime.

It is a super-2 number, since 2×213887831² = 91496008499769122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213881831) 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 as a sum of consecutive naturals, namely, 106943915 + 106943916.

It is an arithmetic number, because the mean of its divisors is an integer number (106943916).

Almost surely, 2^213887831 is an apocalyptic number.

213887831 is a deficient number, since it is larger than the sum of its proper divisors (1).

213887831 is an equidigital number, since it uses as much as digits as its factorization.

213887831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 213887831 is about 14624.9044783205. The cubic root of 213887831 is about 598.0378784223.

The spelling of 213887831 in words is "two hundred thirteen million, eight hundred eighty-seven thousand, eight hundred thirty-one".