78119851 has 2 divisors, whose sum is σ = 78119852. Its totient is φ = 78119850.

The previous prime is 78119819. The next prime is 78119897. The reversal of 78119851 is 15891187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78119851 - 2⁵ = 78119819 is a prime.

It is a super-2 number, since 2×78119851² = 12205422240524402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78119551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39059925 + 39059926.

It is an arithmetic number, because the mean of its divisors is an integer number (39059926).

Almost surely, 2^78119851 is an apocalyptic number.

78119851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78119851 is an equidigital number, since it uses as much as digits as its factorization.

78119851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 40.

The square root of 78119851 is about 8838.5434886072. The cubic root of 78119851 is about 427.4845948189.

The spelling of 78119851 in words is "seventy-eight million, one hundred nineteen thousand, eight hundred fifty-one".