8135380881 has 10 divisors (see below), whose sum is σ = 12152853042. Its totient is φ = 5423587200.

The previous prime is 8135380819. The next prime is 8135380901. The reversal of 8135380881 is 1880835318.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7659050256 + 476330625 = 87516^2 + 21825^2 .

It is not a de Polignac number, because 8135380881 - 2¹¹ = 8135378833 is a prime.

It is a super-2 number, since 2×8135380881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8135380811) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50218320 + ... + 50218481.

Almost surely, 2^8135380881 is an apocalyptic number.

8135380881 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8135380881 is a deficient number, since it is larger than the sum of its proper divisors (4017472161).

8135380881 is a wasteful number, since it uses less digits than its factorization.

8135380881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100436813 (or 100436804 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 8135380881 is about 90196.3462730060. The cubic root of 8135380881 is about 2011.2186928838.

The spelling of 8135380881 in words is "eight billion, one hundred thirty-five million, three hundred eighty thousand, eight hundred eighty-one".