213043531 has 2 divisors, whose sum is σ = 213043532. Its totient is φ = 213043530.

The previous prime is 213043489. The next prime is 213043547. The reversal of 213043531 is 135340312.

213043531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213043531 - 2¹¹ = 213041483 is a prime.

It is a super-2 number, since 2×213043531² = 90775092201895922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213043591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106521765 + 106521766.

It is an arithmetic number, because the mean of its divisors is an integer number (106521766).

Almost surely, 2^213043531 is an apocalyptic number.

213043531 is a deficient number, since it is larger than the sum of its proper divisors (1).

213043531 is an equidigital number, since it uses as much as digits as its factorization.

213043531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 213043531 is about 14596.0107906236. The cubic root of 213043531 is about 597.2499432746.

Adding to 213043531 its reverse (135340312), we get a palindrome (348383843).

The spelling of 213043531 in words is "two hundred thirteen million, forty-three thousand, five hundred thirty-one".