78954013 has 2 divisors, whose sum is σ = 78954014. Its totient is φ = 78954012.

The previous prime is 78954011. The next prime is 78954017. The reversal of 78954013 is 31045987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75724804 + 3229209 = 8702^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 78954013 - 2¹ = 78954011 is a prime.

Together with 78954011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78954011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39477006 + 39477007.

It is an arithmetic number, because the mean of its divisors is an integer number (39477007).

Almost surely, 2^78954013 is an apocalyptic number.

It is an amenable number.

78954013 is a deficient number, since it is larger than the sum of its proper divisors (1).

78954013 is an equidigital number, since it uses as much as digits as its factorization.

78954013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 78954013 is about 8885.6070698630. The cubic root of 78954013 is about 429.0007679434. Note that the first 3 decimals are identical.

The spelling of 78954013 in words is "seventy-eight million, nine hundred fifty-four thousand, thirteen".