43321312431 has 8 divisors (see below), whose sum is σ = 64179722160. Its totient is φ = 28880874936.

The previous prime is 43321312427. The next prime is 43321312481. The reversal of 43321312431 is 13421312334.

It is a happy number.

43321312431 is a `hidden beast` number, since 4 + 3 + 3 + 213 + 12 + 431 = 666.

It is not a de Polignac number, because 43321312431 - 2² = 43321312427 is a prime.

It is a super-2 number, since 2×43321312431² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1604493053 = 43321312431 / (4 + 3 + 3 + 2 + 1 + 3 + 1 + 2 + 4 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 43321312395 and 43321312404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43321312481) 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 in 7 ways as a sum of consecutive naturals, for example, 802246500 + ... + 802246553.

It is an arithmetic number, because the mean of its divisors is an integer number (8022465270).

Almost surely, 2^43321312431 is an apocalyptic number.

43321312431 is a deficient number, since it is larger than the sum of its proper divisors (20858409729).

43321312431 is a wasteful number, since it uses less digits than its factorization.

43321312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604493062 (or 1604493056 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 43321312431 its reverse (13421312334), we get a palindrome (56742624765).

The spelling of 43321312431 in words is "forty-three billion, three hundred twenty-one million, three hundred twelve thousand, four hundred thirty-one".