78012497 has 2 divisors, whose sum is σ = 78012498. Its totient is φ = 78012496.

The previous prime is 78012491. The next prime is 78012503. The reversal of 78012497 is 79421087.

It is a balanced prime because it is at equal distance from previous prime (78012491) and next prime (78012503).

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 36590401 = 6436^2 + 6049^2 .

It is an emirp because it is prime and its reverse (79421087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78012497 - 2¹² = 78008401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78012497.

It is not a weakly prime, because it can be changed into another prime (78012491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39006248 + 39006249.

It is an arithmetic number, because the mean of its divisors is an integer number (39006249).

Almost surely, 2^78012497 is an apocalyptic number.

It is an amenable number.

78012497 is a deficient number, since it is larger than the sum of its proper divisors (1).

78012497 is an equidigital number, since it uses as much as digits as its factorization.

78012497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 78012497 is about 8832.4683412962. The cubic root of 78012497 is about 427.2886855049.

The spelling of 78012497 in words is "seventy-eight million, twelve thousand, four hundred ninety-seven".