320402231 has 2 divisors, whose sum is σ = 320402232. Its totient is φ = 320402230.

The previous prime is 320402221. The next prime is 320402233. The reversal of 320402231 is 132204023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320402231 is a prime.

It is a super-2 number, since 2×320402231² = 205315179259554722, which contains 22 as substring.

Together with 320402233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320402233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160201115 + 160201116.

It is an arithmetic number, because the mean of its divisors is an integer number (160201116).

Almost surely, 2^320402231 is an apocalyptic number.

320402231 is a deficient number, since it is larger than the sum of its proper divisors (1).

320402231 is an equidigital number, since it uses as much as digits as its factorization.

320402231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 320402231 is about 17899.7829875113. The cubic root of 320402231 is about 684.2768442341.

Adding to 320402231 its reverse (132204023), we get a palindrome (452606254).

The spelling of 320402231 in words is "three hundred twenty million, four hundred two thousand, two hundred thirty-one".