838631149693 has 4 divisors (see below), whose sum is σ = 850119247708. Its totient is φ = 827143051680.

The previous prime is 838631149669. The next prime is 838631149721. The reversal of 838631149693 is 396941136838.

838631149693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 564245852569 + 274385297124 = 751163^2 + 523818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838631149693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838631149663) 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, 5744048898 + ... + 5744049043.

It is an arithmetic number, because the mean of its divisors is an integer number (212529811927).

Almost surely, 2^838631149693 is an apocalyptic number.

It is an amenable number.

838631149693 is a deficient number, since it is larger than the sum of its proper divisors (11488098015).

838631149693 is a wasteful number, since it uses less digits than its factorization.

838631149693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11488098014.

The product of its digits is 20155392, while the sum is 61.

The spelling of 838631149693 in words is "eight hundred thirty-eight billion, six hundred thirty-one million, one hundred forty-nine thousand, six hundred ninety-three".