213531523 has 2 divisors, whose sum is σ = 213531524. Its totient is φ = 213531522.

The previous prime is 213531499. The next prime is 213531569. The reversal of 213531523 is 325135312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213531523 is a prime.

It is a super-2 number, since 2×213531523² = 91191422629399058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213531023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106765761 + 106765762.

It is an arithmetic number, because the mean of its divisors is an integer number (106765762).

Almost surely, 2^213531523 is an apocalyptic number.

213531523 is a deficient number, since it is larger than the sum of its proper divisors (1).

213531523 is an equidigital number, since it uses as much as digits as its factorization.

213531523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 25.

The square root of 213531523 is about 14612.7178512418. The cubic root of 213531523 is about 597.7056106273.

Adding to 213531523 its reverse (325135312), we get a palindrome (538666835).

The spelling of 213531523 in words is "two hundred thirteen million, five hundred thirty-one thousand, five hundred twenty-three".