31123646345413 has 4 divisors (see below), whose sum is σ = 31152761076460. Its totient is φ = 31094531614368.

The previous prime is 31123646345381. The next prime is 31123646345419. The reversal of 31123646345413 is 31454364632113.

It is a happy number.

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 25459522422049 + 5664123923364 = 5045743^2 + 2379942^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123646345413 - 2⁵ = 31123646345381 is a prime.

It is a super-2 number, since 2×31123646345413² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123646345419) 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, 14557363920 + ... + 14557366057.

It is an arithmetic number, because the mean of its divisors is an integer number (7788190269115).

Almost surely, 2^{31123646345413} is an apocalyptic number.

It is an amenable number.

31123646345413 is a deficient number, since it is larger than the sum of its proper divisors (29114731047).

31123646345413 is a wasteful number, since it uses less digits than its factorization.

31123646345413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29114731046.

The product of its digits is 1866240, while the sum is 46.

The spelling of 31123646345413 in words is "thirty-one trillion, one hundred twenty-three billion, six hundred forty-six million, three hundred forty-five thousand, four hundred thirteen".