78543901 has 2 divisors, whose sum is σ = 78543902. Its totient is φ = 78543900.

The previous prime is 78543889. The next prime is 78543911. The reversal of 78543901 is 10934587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 18481401 = 7750^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 78543901 - 2⁵ = 78543869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78543911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39271950 + 39271951.

It is an arithmetic number, because the mean of its divisors is an integer number (39271951).

Almost surely, 2^78543901 is an apocalyptic number.

It is an amenable number.

78543901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78543901 is an equidigital number, since it uses as much as digits as its factorization.

78543901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 78543901 is about 8862.4997038082. The cubic root of 78543901 is about 428.2566897778.

The spelling of 78543901 in words is "seventy-eight million, five hundred forty-three thousand, nine hundred one".