78238241 has 2 divisors, whose sum is σ = 78238242. Its totient is φ = 78238240.

The previous prime is 78238231. The next prime is 78238247. The reversal of 78238241 is 14283287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 22287841 = 7480^2 + 4721^2 .

It is an emirp because it is prime and its reverse (14283287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78238241 - 2¹⁰ = 78237217 is a prime.

It is a super-2 number, since 2×78238241² = 12242444709548162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78238247) 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, 39119120 + 39119121.

It is an arithmetic number, because the mean of its divisors is an integer number (39119121).

Almost surely, 2^78238241 is an apocalyptic number.

It is an amenable number.

78238241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78238241 is an equidigital number, since it uses as much as digits as its factorization.

78238241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 35.

The square root of 78238241 is about 8845.2383235275. The cubic root of 78238241 is about 427.7004356317.

The spelling of 78238241 in words is "seventy-eight million, two hundred thirty-eight thousand, two hundred forty-one".