31103012431 has 4 divisors (see below), whose sum is σ = 31104650664. Its totient is φ = 31101374200.

The previous prime is 31103012393. The next prime is 31103012441. The reversal of 31103012431 is 13421030113.

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 31103012431 - 2²⁵ = 31069457999 is a prime.

It is a super-2 number, since 2×31103012431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103012399 and 31103012408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103012441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790300 + ... + 828721.

It is an arithmetic number, because the mean of its divisors is an integer number (7776162666).

Almost surely, 2^31103012431 is an apocalyptic number.

31103012431 is a deficient number, since it is larger than the sum of its proper divisors (1638233).

31103012431 is a wasteful number, since it uses less digits than its factorization.

31103012431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638232.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31103012431 its reverse (13421030113), we get a palindrome (44524042544).

The spelling of 31103012431 in words is "thirty-one billion, one hundred three million, twelve thousand, four hundred thirty-one".