212304531 has 4 divisors (see below), whose sum is σ = 283072712. Its totient is φ = 141536352.

The previous prime is 212304529. The next prime is 212304553. The reversal of 212304531 is 135403212.

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

It is not a de Polignac number, because 212304531 - 2¹ = 212304529 is a prime.

It is a super-2 number, since 2×212304531² = 90146427766259922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212304498 and 212304507.

It is not an unprimeable number, because it can be changed into a prime (212304511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35384086 + ... + 35384091.

It is an arithmetic number, because the mean of its divisors is an integer number (70768178).

Almost surely, 2^212304531 is an apocalyptic number.

212304531 is a deficient number, since it is larger than the sum of its proper divisors (70768181).

212304531 is an equidigital number, since it uses as much as digits as its factorization.

212304531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70768180.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 212304531 is about 14570.6736632182. The cubic root of 212304531 is about 596.5585680945.

Adding to 212304531 its reverse (135403212), we get a palindrome (347707743).

The spelling of 212304531 in words is "two hundred twelve million, three hundred four thousand, five hundred thirty-one".