78948137 has 2 divisors, whose sum is σ = 78948138. Its totient is φ = 78948136.

The previous prime is 78948101. The next prime is 78948139. The reversal of 78948137 is 73184987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 13402921 = 8096^2 + 3661^2 .

It is an emirp because it is prime and its reverse (73184987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78948137 is a prime.

Together with 78948139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78948091 and 78948100.

It is not a weakly prime, because it can be changed into another prime (78948139) 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, 39474068 + 39474069.

It is an arithmetic number, because the mean of its divisors is an integer number (39474069).

Almost surely, 2^78948137 is an apocalyptic number.

It is an amenable number.

78948137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78948137 is an equidigital number, since it uses as much as digits as its factorization.

78948137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 78948137 is about 8885.2764166344. The cubic root of 78948137 is about 428.9901251614.

The spelling of 78948137 in words is "seventy-eight million, nine hundred forty-eight thousand, one hundred thirty-seven".