78814913 has 2 divisors, whose sum is σ = 78814914. Its totient is φ = 78814912.

The previous prime is 78814877. The next prime is 78814919. The reversal of 78814913 is 31941887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78552769 + 262144 = 8863^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 78814913 - 2⁶ = 78814849 is a prime.

It is a super-2 number, since 2×78814913² = 12423581022395138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78814919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39407456 + 39407457.

It is an arithmetic number, because the mean of its divisors is an integer number (39407457).

Almost surely, 2^78814913 is an apocalyptic number.

It is an amenable number.

78814913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78814913 is an equidigital number, since it uses as much as digits as its factorization.

78814913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 78814913 is about 8877.7763544708. The cubic root of 78814913 is about 428.7486841327.

The spelling of 78814913 in words is "seventy-eight million, eight hundred fourteen thousand, nine hundred thirteen".