31222133431 has 4 divisors (see below), whose sum is σ = 31223063664. Its totient is φ = 31221203200.

The previous prime is 31222133407. The next prime is 31222133443. The reversal of 31222133431 is 13433122213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31222133431 - 2⁵ = 31222133399 is a prime.

It is a super-4 number, since 4×31222133431⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31222133396 and 31222133405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222131431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412810 + ... + 482551.

It is an arithmetic number, because the mean of its divisors is an integer number (7805765916).

Almost surely, 2^31222133431 is an apocalyptic number.

31222133431 is a deficient number, since it is larger than the sum of its proper divisors (930233).

31222133431 is an equidigital number, since it uses as much as digits as its factorization.

31222133431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930232.

The product of its digits is 2592, while the sum is 25.

Adding to 31222133431 its reverse (13433122213), we get a palindrome (44655255644).

The spelling of 31222133431 in words is "thirty-one billion, two hundred twenty-two million, one hundred thirty-three thousand, four hundred thirty-one".