838215322681 has 9 divisors (see below), whose sum is σ = 921355184869. Its totient is φ = 762004774300.

The previous prime is 838215322673. The next prime is 838215322687. The reversal of 838215322681 is 186223512838.

The square root of 838215322681 is 915541.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 838215322681 - 2³ = 838215322673 is a prime.

It is a super-2 number, since 2×838215322681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838215322687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10029336 + ... + 10112566.

Almost surely, 2^838215322681 is an apocalyptic number.

838215322681 is the 915541-st square number.

838215322681 is the 457771-st centered octagonal number.

It is an amenable number.

838215322681 is a deficient number, since it is larger than the sum of its proper divisors (83139862188).

838215322681 is an frugal number, since it uses more digits than its factorization.

838215322681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166484 (or 83242 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

Multiplying 838215322681 by its sum of digits (49), we get a square (41072550811369 = 6408787²).

The spelling of 838215322681 in words is "eight hundred thirty-eight billion, two hundred fifteen million, three hundred twenty-two thousand, six hundred eighty-one".