78975199 has 2 divisors, whose sum is σ = 78975200. Its totient is φ = 78975198.

The previous prime is 78975179. The next prime is 78975209. The reversal of 78975199 is 99157987.

It is a strong prime.

It is an emirp because it is prime and its reverse (99157987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78975199 - 2⁵ = 78975167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78975109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39487599 + 39487600.

It is an arithmetic number, because the mean of its divisors is an integer number (39487600).

Almost surely, 2^78975199 is an apocalyptic number.

78975199 is a deficient number, since it is larger than the sum of its proper divisors (1).

78975199 is an equidigital number, since it uses as much as digits as its factorization.

78975199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 55.

The square root of 78975199 is about 8886.7991425485. The cubic root of 78975199 is about 429.0391362590.

The spelling of 78975199 in words is "seventy-eight million, nine hundred seventy-five thousand, one hundred ninety-nine".