78985801 has 2 divisors, whose sum is σ = 78985802. Its totient is φ = 78985800.

The previous prime is 78985769. The next prime is 78985807. The reversal of 78985801 is 10858987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68873401 + 10112400 = 8299^2 + 3180^2 .

It is an emirp because it is prime and its reverse (10858987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78985801 - 2⁵ = 78985769 is a prime.

It is a super-2 number, since 2×78985801² = 12477513519223202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78985807) 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, 39492900 + 39492901.

It is an arithmetic number, because the mean of its divisors is an integer number (39492901).

Almost surely, 2^78985801 is an apocalyptic number.

It is an amenable number.

78985801 is a deficient number, since it is larger than the sum of its proper divisors (1).

78985801 is an equidigital number, since it uses as much as digits as its factorization.

78985801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 78985801 is about 8887.3956252662. The cubic root of 78985801 is about 429.0583341399.

The spelling of 78985801 in words is "seventy-eight million, nine hundred eighty-five thousand, eight hundred one".