78552241 has 2 divisors, whose sum is σ = 78552242. Its totient is φ = 78552240.

The previous prime is 78552239. The next prime is 78552247. The reversal of 78552241 is 14225587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76055841 + 2496400 = 8721^2 + 1580^2 .

It is an emirp because it is prime and its reverse (14225587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78552241 - 2¹ = 78552239 is a prime.

It is a super-2 number, since 2×78552241² = 12340909132244162, which contains 22 as substring.

Together with 78552239, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78552197 and 78552206.

It is not a weakly prime, because it can be changed into another prime (78552247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39276120 + 39276121.

It is an arithmetic number, because the mean of its divisors is an integer number (39276121).

Almost surely, 2^78552241 is an apocalyptic number.

It is an amenable number.

78552241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78552241 is an equidigital number, since it uses as much as digits as its factorization.

78552241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 78552241 is about 8862.9702131960. The cubic root of 78552241 is about 428.2718470522.

The spelling of 78552241 in words is "seventy-eight million, five hundred fifty-two thousand, two hundred forty-one".