78712901 has 2 divisors, whose sum is σ = 78712902. Its totient is φ = 78712900.

The previous prime is 78712891. The next prime is 78712913. The reversal of 78712901 is 10921787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 11062276 = 8225^2 + 3326^2 .

It is an emirp because it is prime and its reverse (10921787) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78712901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78712951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39356450 + 39356451.

It is an arithmetic number, because the mean of its divisors is an integer number (39356451).

Almost surely, 2^78712901 is an apocalyptic number.

It is an amenable number.

78712901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78712901 is an equidigital number, since it uses as much as digits as its factorization.

78712901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 78712901 is about 8872.0291365617. The cubic root of 78712901 is about 428.5636244240.

The spelling of 78712901 in words is "seventy-eight million, seven hundred twelve thousand, nine hundred one".