331442431 has 2 divisors, whose sum is σ = 331442432. Its totient is φ = 331442430.

The previous prime is 331442429. The next prime is 331442437. The reversal of 331442431 is 134244133.

It is a weak prime.

It is an emirp because it is prime and its reverse (134244133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331442431 - 2¹ = 331442429 is a prime.

It is a super-2 number, since 2×331442431² = 219708170134379522, which contains 22 as substring.

Together with 331442429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 331442396 and 331442405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331442437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165721215 + 165721216.

It is an arithmetic number, because the mean of its divisors is an integer number (165721216).

Almost surely, 2^331442431 is an apocalyptic number.

331442431 is a deficient number, since it is larger than the sum of its proper divisors (1).

331442431 is an equidigital number, since it uses as much as digits as its factorization.

331442431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 25.

The square root of 331442431 is about 18205.5604417991. The cubic root of 331442431 is about 692.0477089352.

Adding to 331442431 its reverse (134244133), we get a palindrome (465686564).

The spelling of 331442431 in words is "three hundred thirty-one million, four hundred forty-two thousand, four hundred thirty-one".