239261681 has 2 divisors, whose sum is σ = 239261682. Its totient is φ = 239261680.

The previous prime is 239261677. The next prime is 239261683. The reversal of 239261681 is 186162932.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208080625 + 31181056 = 14425^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 239261681 - 2² = 239261677 is a prime.

It is a super-2 number, since 2×239261681² = 114492303989891522, which contains 22 as substring.

Together with 239261683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (239261683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119630840 + 119630841.

It is an arithmetic number, because the mean of its divisors is an integer number (119630841).

Almost surely, 2^239261681 is an apocalyptic number.

It is an amenable number.

239261681 is a deficient number, since it is larger than the sum of its proper divisors (1).

239261681 is an equidigital number, since it uses as much as digits as its factorization.

239261681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 239261681 is about 15468.0858867541. The cubic root of 239261681 is about 620.8085886008.

The spelling of 239261681 in words is "two hundred thirty-nine million, two hundred sixty-one thousand, six hundred eighty-one".