78945157 has 2 divisors, whose sum is σ = 78945158. Its totient is φ = 78945156.

The previous prime is 78945151. The next prime is 78945187. The reversal of 78945157 is 75154987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77422401 + 1522756 = 8799^2 + 1234^2 .

It is an emirp because it is prime and its reverse (75154987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78945157 - 2³ = 78945149 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 (78945151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39472578 + 39472579.

It is an arithmetic number, because the mean of its divisors is an integer number (39472579).

Almost surely, 2^78945157 is an apocalyptic number.

It is an amenable number.

78945157 is a deficient number, since it is larger than the sum of its proper divisors (1).

78945157 is an equidigital number, since it uses as much as digits as its factorization.

78945157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 46.

The square root of 78945157 is about 8885.1087219009. The cubic root of 78945157 is about 428.9847274970.

The spelling of 78945157 in words is "seventy-eight million, nine hundred forty-five thousand, one hundred fifty-seven".