239971081 has 9 divisors (see below), whose sum is σ = 279276231. Its totient is φ = 205596552.

The previous prime is 239971079. The next prime is 239971097. The reversal of 239971081 is 180179932.

The square root of 239971081 is 15491.

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

239971081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 238239225 + 1731856 = 15435^2 + 1316^2 .

It is not a de Polignac number, because 239971081 - 2¹ = 239971079 is a prime.

It is a super-2 number, since 2×239971081² = 115172239432617122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239971001) 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, 107331 + ... + 109543.

Almost surely, 2^239971081 is an apocalyptic number.

239971081 is the 15491-st square number.

239971081 is the 7746-th centered octagonal number.

It is an amenable number.

239971081 is a deficient number, since it is larger than the sum of its proper divisors (39305150).

239971081 is an frugal number, since it uses more digits than its factorization.

239971081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The cubic root of 239971081 is about 621.4215396168.

The spelling of 239971081 in words is "two hundred thirty-nine million, nine hundred seventy-one thousand, eighty-one".