31323420431 has 4 divisors (see below), whose sum is σ = 33165974592. Its totient is φ = 29480866272.

The previous prime is 31323420409. The next prime is 31323420433. The reversal of 31323420431 is 13402432313.

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 31323420431 - 2¹⁸ = 31323158287 is a prime.

It is a super-2 number, since 2×31323420431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31323420431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323420433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921277055 + ... + 921277088.

It is an arithmetic number, because the mean of its divisors is an integer number (8291493648).

Almost surely, 2^31323420431 is an apocalyptic number.

31323420431 is a deficient number, since it is larger than the sum of its proper divisors (1842554161).

31323420431 is a wasteful number, since it uses less digits than its factorization.

31323420431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842554160.

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

Adding to 31323420431 its reverse (13402432313), we get a palindrome (44725852744).

The spelling of 31323420431 in words is "thirty-one billion, three hundred twenty-three million, four hundred twenty thousand, four hundred thirty-one".