78961339 has 2 divisors, whose sum is σ = 78961340. Its totient is φ = 78961338.

The previous prime is 78961331. The next prime is 78961417. The reversal of 78961339 is 93316987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78961339 - 2³ = 78961331 is a prime.

It is not a weakly prime, because it can be changed into another prime (78961331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480669 + 39480670.

It is an arithmetic number, because the mean of its divisors is an integer number (39480670).

Almost surely, 2^78961339 is an apocalyptic number.

78961339 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961339 is an equidigital number, since it uses as much as digits as its factorization.

78961339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 78961339 is about 8886.0193000015. The cubic root of 78961339 is about 429.0140362681.

It can be divided in two parts, 789 and 61339, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 78961339 in words is "seventy-eight million, nine hundred sixty-one thousand, three hundred thirty-nine".