31043454531 has 4 divisors (see below), whose sum is σ = 41391272712. Its totient is φ = 20695636352.

The previous prime is 31043454517. The next prime is 31043454539. The reversal of 31043454531 is 13545434013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13545434013 = 3 ⋅4515144671.

It is a cyclic number.

It is not a de Polignac number, because 31043454531 - 2¹⁷ = 31043323459 is a prime.

It is a super-2 number, since 2×31043454531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31043454492 and 31043454501.

It is not an unprimeable number, because it can be changed into a prime (31043454539) 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 3 ways as a sum of consecutive naturals, for example, 5173909086 + ... + 5173909091.

It is an arithmetic number, because the mean of its divisors is an integer number (10347818178).

Almost surely, 2^31043454531 is an apocalyptic number.

31043454531 is a deficient number, since it is larger than the sum of its proper divisors (10347818181).

31043454531 is a wasteful number, since it uses less digits than its factorization.

31043454531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10347818180.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 31043454531 its reverse (13545434013), we get a palindrome (44588888544).

The spelling of 31043454531 in words is "thirty-one billion, forty-three million, four hundred fifty-four thousand, five hundred thirty-one".