320212531 has 4 divisors (see below), whose sum is σ = 320740672. Its totient is φ = 319684392.

The previous prime is 320212523. The next prime is 320212537. The reversal of 320212531 is 135212023.

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

It is a cyclic number.

It is not a de Polignac number, because 320212531 - 2³ = 320212523 is a prime.

It is a super-2 number, since 2×320212531² = 205072130018851922, 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 = 320212499 and 320212508.

It is not an unprimeable number, because it can be changed into a prime (320212537) 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, 263160 + ... + 264373.

It is an arithmetic number, because the mean of its divisors is an integer number (80185168).

Almost surely, 2^320212531 is an apocalyptic number.

320212531 is a deficient number, since it is larger than the sum of its proper divisors (528141).

320212531 is an equidigital number, since it uses as much as digits as its factorization.

320212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528140.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 320212531 is about 17894.4832560206. The cubic root of 320212531 is about 684.1417713668.

Adding to 320212531 its reverse (135212023), we get a palindrome (455424554).

The spelling of 320212531 in words is "three hundred twenty million, two hundred twelve thousand, five hundred thirty-one".