78837851 has 2 divisors, whose sum is σ = 78837852. Its totient is φ = 78837850.

The previous prime is 78837833. The next prime is 78837853. The reversal of 78837851 is 15873887.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78837851 is a prime.

Together with 78837853, 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 = 78837796 and 78837805.

It is not a weakly prime, because it can be changed into another prime (78837853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39418925 + 39418926.

It is an arithmetic number, because the mean of its divisors is an integer number (39418926).

Almost surely, 2^78837851 is an apocalyptic number.

78837851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78837851 is an equidigital number, since it uses as much as digits as its factorization.

78837851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 47.

The square root of 78837851 is about 8879.0681380424. The cubic root of 78837851 is about 428.7902739072.

The spelling of 78837851 in words is "seventy-eight million, eight hundred thirty-seven thousand, eight hundred fifty-one".