6931388052 has 30 divisors (see below), whose sum is σ = 18120018378. Its totient is φ = 2310462576.

The previous prime is 6931388047. The next prime is 6931388063. The reversal of 6931388052 is 2508831396.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5451754896 + 1479633156 = 73836^2 + 38466^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6931387989 and 6931388007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10696263 + ... + 10696910.

Almost surely, 2^6931388052 is an apocalyptic number.

It is an amenable number.

6931388052 is an abundant number, since it is smaller than the sum of its proper divisors (11188630326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6931388052 is a wasteful number, since it uses less digits than its factorization.

6931388052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21393189 (or 21393178 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6931388052 is about 83254.9581226247. The cubic root of 6931388052 is about 1906.6606537348.

The spelling of 6931388052 in words is "six billion, nine hundred thirty-one million, three hundred eighty-eight thousand, fifty-two".