78120241 has 2 divisors, whose sum is σ = 78120242. Its totient is φ = 78120240.

The previous prime is 78120239. The next prime is 78120271. The reversal of 78120241 is 14202187.

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., 64400625 + 13719616 = 8025^2 + 3704^2 .

It is a cyclic number.

It is not a de Polignac number, because 78120241 - 2¹ = 78120239 is a prime.

It is a super-2 number, since 2×78120241² = 12205544107796162, which contains 22 as substring.

Together with 78120239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78120271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39060120 + 39060121.

It is an arithmetic number, because the mean of its divisors is an integer number (39060121).

Almost surely, 2^78120241 is an apocalyptic number.

It is an amenable number.

78120241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78120241 is an equidigital number, since it uses as much as digits as its factorization.

78120241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 78120241 is about 8838.5655510382. The cubic root of 78120241 is about 427.4853061990.

It can be divided in two parts, 7812024 and 1, that added together give a square (7812025 = 2795²).

The spelling of 78120241 in words is "seventy-eight million, one hundred twenty thousand, two hundred forty-one".