231706486881 has 9 divisors (see below), whose sum is σ = 334689233619. Its totient is φ = 154470028536.

The previous prime is 231706486867. The next prime is 231706486901. The reversal of 231706486881 is 188684607132.

The square root of 231706486881 is 481359.

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

It can be written as a sum of positive squares in only one way, i.e., 4829555025 + 226876931856 = 69495^2 + 476316^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 231706486881 - 2⁵ = 231706486849 is a prime.

It is a super-2 number, since 2×231706486881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231706486811) 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, 1363851 + ... + 1524303.

Almost surely, 2^231706486881 is an apocalyptic number.

231706486881 is the 481359-th square number.

231706486881 is the 240680-th centered octagonal number.

It is an amenable number.

231706486881 is a deficient number, since it is larger than the sum of its proper divisors (102982746738).

231706486881 is an frugal number, since it uses more digits than its factorization.

231706486881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320912 (or 160456 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 231706486881 in words is "two hundred thirty-one billion, seven hundred six million, four hundred eighty-six thousand, eight hundred eighty-one".