6400432331 has 2 divisors, whose sum is σ = 6400432332. Its totient is φ = 6400432330.

The previous prime is 6400432279. The next prime is 6400432343. The reversal of 6400432331 is 1332340046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400432331 is a prime.

It is a super-2 number, since 2×6400432331² = 81931068047420187122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6400432331.

It is not a weakly prime, because it can be changed into another prime (6400462331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200216165 + 3200216166.

It is an arithmetic number, because the mean of its divisors is an integer number (3200216166).

Almost surely, 2^6400432331 is an apocalyptic number.

6400432331 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400432331 is an equidigital number, since it uses as much as digits as its factorization.

6400432331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 6400432331 is about 80002.7020231192. The cubic root of 6400432331 is about 1856.6773388109.

Adding to 6400432331 its reverse (1332340046), we get a palindrome (7732772377).

The spelling of 6400432331 in words is "six billion, four hundred million, four hundred thirty-two thousand, three hundred thirty-one".