78811841 has 2 divisors, whose sum is σ = 78811842. Its totient is φ = 78811840.

The previous prime is 78811807. The next prime is 78811861. The reversal of 78811841 is 14811887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45171841 + 33640000 = 6721^2 + 5800^2 .

It is a cyclic number.

It is not a de Polignac number, because 78811841 - 2²² = 74617537 is a prime.

It is a super-2 number, since 2×78811841² = 12422612563618562, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78811795 and 78811804.

It is not a weakly prime, because it can be changed into another prime (78811801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39405920 + 39405921.

It is an arithmetic number, because the mean of its divisors is an integer number (39405921).

Almost surely, 2^78811841 is an apocalyptic number.

It is an amenable number.

78811841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78811841 is an equidigital number, since it uses as much as digits as its factorization.

78811841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 38.

The square root of 78811841 is about 8877.6033364867. The cubic root of 78811841 is about 428.7431135580.

The spelling of 78811841 in words is "seventy-eight million, eight hundred eleven thousand, eight hundred forty-one".