239219081 has 2 divisors, whose sum is σ = 239219082. Its totient is φ = 239219080.

The previous prime is 239219047. The next prime is 239219083. The reversal of 239219081 is 180912932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228493456 + 10725625 = 15116^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 239219081 - 2¹⁸ = 238956937 is a prime.

It is a super-2 number, since 2×239219081² = 114451537428969122, which contains 22 as substring.

Together with 239219083, 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 (239219083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119609540 + 119609541.

It is an arithmetic number, because the mean of its divisors is an integer number (119609541).

Almost surely, 2^239219081 is an apocalyptic number.

It is an amenable number.

239219081 is a deficient number, since it is larger than the sum of its proper divisors (1).

239219081 is an equidigital number, since it uses as much as digits as its factorization.

239219081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 239219081 is about 15466.7087966380. The cubic root of 239219081 is about 620.7717418932.

The spelling of 239219081 in words is "two hundred thirty-nine million, two hundred nineteen thousand, eighty-one".