31000332005 has 4 divisors (see below), whose sum is σ = 37200398412. Its totient is φ = 24800265600.

The previous prime is 31000331981. The next prime is 31000332061. The reversal of 31000332005 is 50023300013.

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 4445022241 + 26555309764 = 66671^2 + 162958^2 .

It is not a de Polignac number, because 31000332005 - 2¹⁰ = 31000330981 is a prime.

It is a super-2 number, since 2×31000332005² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100033196 + ... + 3100033205.

It is an arithmetic number, because the mean of its divisors is an integer number (9300099603).

Almost surely, 2^31000332005 is an apocalyptic number.

It is an amenable number.

31000332005 is a deficient number, since it is larger than the sum of its proper divisors (6200066407).

31000332005 is an equidigital number, since it uses as much as digits as its factorization.

31000332005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200066406.

The product of its (nonzero) digits is 270, while the sum is 17.

Adding to 31000332005 its reverse (50023300013), we get a palindrome (81023632018).

The spelling of 31000332005 in words is "thirty-one billion, three hundred thirty-two thousand, five".