8261173881 has 15 divisors (see below), whose sum is σ = 12341988021. Its totient is φ = 5506903908.

The previous prime is 8261173873. The next prime is 8261173891. The reversal of 8261173881 is 1883711628.

It is a happy number.

The square root of 8261173881 is 90891.

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

8261173881 is a `hidden beast` number, since 8 + 261 + 1 + 7 + 388 + 1 = 666.

It is not a de Polignac number, because 8261173881 - 2³ = 8261173873 is a prime.

It is a super-2 number, since 2×8261173881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8261173801) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 812970 + ... + 823068.

Almost surely, 2^8261173881 is an apocalyptic number.

8261173881 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

8261173881 is the 90891-st square number.

8261173881 is the 45446-th centered octagonal number.

It is an amenable number.

8261173881 is a deficient number, since it is larger than the sum of its proper divisors (4080814140).

8261173881 is an frugal number, since it uses more digits than its factorization.

8261173881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20210 (or 10102 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The cubic root of 8261173881 is about 2021.5318479612.

The spelling of 8261173881 in words is "eight billion, two hundred sixty-one million, one hundred seventy-three thousand, eight hundred eighty-one".