78313897 has 2 divisors, whose sum is σ = 78313898. Its totient is φ = 78313896.

The previous prime is 78313861. The next prime is 78313901. The reversal of 78313897 is 79831387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68956416 + 9357481 = 8304^2 + 3059^2 .

It is a cyclic number.

It is not a de Polignac number, because 78313897 - 2¹⁵ = 78281129 is a prime.

It is a super-2 number, since 2×78313897² = 12266132926653218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78313817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39156948 + 39156949.

It is an arithmetic number, because the mean of its divisors is an integer number (39156949).

Almost surely, 2^78313897 is an apocalyptic number.

It is an amenable number.

78313897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78313897 is an equidigital number, since it uses as much as digits as its factorization.

78313897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 78313897 is about 8849.5139414546. The cubic root of 78313897 is about 427.8382526348.

The spelling of 78313897 in words is "seventy-eight million, three hundred thirteen thousand, eight hundred ninety-seven".