31389450503 has 18 divisors (see below), whose sum is σ = 32874867792. Its totient is φ = 29957205600.

The previous prime is 31389450493. The next prime is 31389450509. The reversal of 31389450503 is 30505498313.

It is a happy number.

It is not a de Polignac number, because 31389450503 - 2²⁰ = 31388401927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31389450509) 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 17 ways as a sum of consecutive naturals, for example, 52228403 + ... + 52229003.

It is an arithmetic number, because the mean of its divisors is an integer number (1826381544).

Almost surely, 2^31389450503 is an apocalyptic number.

31389450503 is a deficient number, since it is larger than the sum of its proper divisors (1485417289).

31389450503 is an frugal number, since it uses more digits than its factorization.

31389450503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 31389450503 in words is "thirty-one billion, three hundred eighty-nine million, four hundred fifty thousand, five hundred three".