31123232005 has 4 divisors (see below), whose sum is σ = 37347878412. Its totient is φ = 24898585600.

The previous prime is 31123231991. The next prime is 31123232027. The reversal of 31123232005 is 50023232113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15238914916 + 15884317089 = 123446^2 + 126033^2 .

It is not a de Polignac number, because 31123232005 - 2⁵ = 31123231973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 3112323196 + ... + 3112323205.

It is an arithmetic number, because the mean of its divisors is an integer number (9336969603).

Almost surely, 2^31123232005 is an apocalyptic number.

It is an amenable number.

31123232005 is a deficient number, since it is larger than the sum of its proper divisors (6224646407).

31123232005 is an equidigital number, since it uses as much as digits as its factorization.

31123232005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224646406.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 31123232005 its reverse (50023232113), we get a palindrome (81146464118).

The spelling of 31123232005 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, five".