31001023313 has 4 divisors (see below), whose sum is σ = 33385717428. Its totient is φ = 28616329200.

The previous prime is 31001023283. The next prime is 31001023337. The reversal of 31001023313 is 31332010013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31332010013 = 1489 ⋅21042317.

It can be written as a sum of positive squares in 2 ways, for example, as 3389219089 + 27611804224 = 58217^2 + 166168^2 .

It is a cyclic number.

It is not a de Polignac number, because 31001023313 - 2¹⁰ = 31001022289 is a prime.

It is a super-2 number, since 2×31001023313² (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 = 31001023291 and 31001023300.

It is not an unprimeable number, because it can be changed into a prime (31001023913) by changing a digit.

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, 1192347038 + ... + 1192347063.

It is an arithmetic number, because the mean of its divisors is an integer number (8346429357).

Almost surely, 2^31001023313 is an apocalyptic number.

It is an amenable number.

31001023313 is a deficient number, since it is larger than the sum of its proper divisors (2384694115).

31001023313 is a wasteful number, since it uses less digits than its factorization.

31001023313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384694114.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31001023313 its reverse (31332010013), we get a palindrome (62333033326).

The spelling of 31001023313 in words is "thirty-one billion, one million, twenty-three thousand, three hundred thirteen".