402220331 has 2 divisors, whose sum is σ = 402220332. Its totient is φ = 402220330.

The previous prime is 402220327. The next prime is 402220333. The reversal of 402220331 is 133022204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402220331 - 2² = 402220327 is a prime.

It is a super-2 number, since 2×402220331² = 323562389339499122, which contains 22 as substring.

Together with 402220333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402220333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201110165 + 201110166.

It is an arithmetic number, because the mean of its divisors is an integer number (201110166).

Almost surely, 2^402220331 is an apocalyptic number.

402220331 is a deficient number, since it is larger than the sum of its proper divisors (1).

402220331 is an equidigital number, since it uses as much as digits as its factorization.

402220331 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 402220331 is about 20055.4314588343. The cubic root of 402220331 is about 738.1670798968.

Adding to 402220331 its reverse (133022204), we get a palindrome (535242535).

The spelling of 402220331 in words is "four hundred two million, two hundred twenty thousand, three hundred thirty-one".