78413549 has 2 divisors, whose sum is σ = 78413550. Its totient is φ = 78413548.

The previous prime is 78413519. The next prime is 78413557. The reversal of 78413549 is 94531487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77616100 + 797449 = 8810^2 + 893^2 .

It is an emirp because it is prime and its reverse (94531487) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78413549 is a prime.

It is a super-2 number, since 2×78413549² = 12297369333550802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78413519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39206774 + 39206775.

It is an arithmetic number, because the mean of its divisors is an integer number (39206775).

Almost surely, 2^78413549 is an apocalyptic number.

It is an amenable number.

78413549 is a deficient number, since it is larger than the sum of its proper divisors (1).

78413549 is an equidigital number, since it uses as much as digits as its factorization.

78413549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 78413549 is about 8855.1425172043. The cubic root of 78413549 is about 428.0196460106.

The spelling of 78413549 in words is "seventy-eight million, four hundred thirteen thousand, five hundred forty-nine".