78547241 has 2 divisors, whose sum is σ = 78547242. Its totient is φ = 78547240.

The previous prime is 78547237. The next prime is 78547243. The reversal of 78547241 is 14274587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74563225 + 3984016 = 8635^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 78547241 - 2² = 78547237 is a prime.

Together with 78547243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78547195 and 78547204.

It is not a weakly prime, because it can be changed into another prime (78547243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39273620 + 39273621.

It is an arithmetic number, because the mean of its divisors is an integer number (39273621).

Almost surely, 2^78547241 is an apocalyptic number.

It is an amenable number.

78547241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78547241 is an equidigital number, since it uses as much as digits as its factorization.

78547241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 78547241 is about 8862.6881362259. The cubic root of 78547241 is about 428.2627600861.

The spelling of 78547241 in words is "seventy-eight million, five hundred forty-seven thousand, two hundred forty-one".