78961249 has 2 divisors, whose sum is σ = 78961250. Its totient is φ = 78961248.

The previous prime is 78961241. The next prime is 78961271. The reversal of 78961249 is 94216987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49801249 + 29160000 = 7057^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 78961249 - 2³ = 78961241 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78961199 and 78961208.

It is not a weakly prime, because it can be changed into another prime (78961241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480624 + 39480625.

It is an arithmetic number, because the mean of its divisors is an integer number (39480625).

Almost surely, 2^78961249 is an apocalyptic number.

It is an amenable number.

78961249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961249 is an equidigital number, since it uses as much as digits as its factorization.

78961249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 78961249 is about 8886.0142358653. The cubic root of 78961249 is about 429.0138732715.

The spelling of 78961249 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred forty-nine".