78599149 has 2 divisors, whose sum is σ = 78599150. Its totient is φ = 78599148.

The previous prime is 78599123. The next prime is 78599179. The reversal of 78599149 is 94199587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75377124 + 3222025 = 8682^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 78599149 - 2⁷ = 78599021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78599096 and 78599105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78599179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39299574 + 39299575.

It is an arithmetic number, because the mean of its divisors is an integer number (39299575).

Almost surely, 2^78599149 is an apocalyptic number.

It is an amenable number.

78599149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78599149 is an equidigital number, since it uses as much as digits as its factorization.

78599149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 78599149 is about 8865.6161094421. The cubic root of 78599149 is about 428.3570785620.

The spelling of 78599149 in words is "seventy-eight million, five hundred ninety-nine thousand, one hundred forty-nine".