78999611 has 2 divisors, whose sum is σ = 78999612. Its totient is φ = 78999610.

The previous prime is 78999593. The next prime is 78999619. The reversal of 78999611 is 11699987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78999611 - 2¹⁸ = 78737467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78999611.

It is not a weakly prime, because it can be changed into another prime (78999619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39499805 + 39499806.

It is an arithmetic number, because the mean of its divisors is an integer number (39499806).

Almost surely, 2^78999611 is an apocalyptic number.

78999611 is a deficient number, since it is larger than the sum of its proper divisors (1).

78999611 is an equidigital number, since it uses as much as digits as its factorization.

78999611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 50.

The square root of 78999611 is about 8888.1725343290. The cubic root of 78999611 is about 429.0833384243.

The spelling of 78999611 in words is "seventy-eight million, nine hundred ninety-nine thousand, six hundred eleven".