78119897 has 2 divisors, whose sum is σ = 78119898. Its totient is φ = 78119896.

The previous prime is 78119851. The next prime is 78119911. The reversal of 78119897 is 79891187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58308496 + 19811401 = 7636^2 + 4451^2 .

It is a cyclic number.

It is not a de Polignac number, because 78119897 - 2¹² = 78115801 is a prime.

It is a super-2 number, since 2×78119897² = 12205436614581218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78109897) 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, 39059948 + 39059949.

It is an arithmetic number, because the mean of its divisors is an integer number (39059949).

Almost surely, 2^78119897 is an apocalyptic number.

It is an amenable number.

78119897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78119897 is an equidigital number, since it uses as much as digits as its factorization.

78119897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 50.

The square root of 78119897 is about 8838.5460908455. The cubic root of 78119897 is about 427.4846787254.

The spelling of 78119897 in words is "seventy-eight million, one hundred nineteen thousand, eight hundred ninety-seven".