78698941 has 2 divisors, whose sum is σ = 78698942. Its totient is φ = 78698940.

The previous prime is 78698929. The next prime is 78698947. The reversal of 78698941 is 14989687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58583716 + 20115225 = 7654^2 + 4485^2 .

It is an emirp because it is prime and its reverse (14989687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78698941 - 2⁷ = 78698813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78698947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39349470 + 39349471.

It is an arithmetic number, because the mean of its divisors is an integer number (39349471).

Almost surely, 2^78698941 is an apocalyptic number.

It is an amenable number.

78698941 is a deficient number, since it is larger than the sum of its proper divisors (1).

78698941 is an equidigital number, since it uses as much as digits as its factorization.

78698941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 78698941 is about 8871.2423594444. The cubic root of 78698941 is about 428.5382871886.

The spelling of 78698941 in words is "seventy-eight million, six hundred ninety-eight thousand, nine hundred forty-one".