78101081 has 2 divisors, whose sum is σ = 78101082. Its totient is φ = 78101080.

The previous prime is 78101071. The next prime is 78101083. The reversal of 78101081 is 18010187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76387600 + 1713481 = 8740^2 + 1309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78101081 is a prime.

It is a super-2 number, since 2×78101081² = 12199557706737122, which contains 22 as substring.

Together with 78101083, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78101081.

It is not a weakly prime, because it can be changed into another prime (78101083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39050540 + 39050541.

It is an arithmetic number, because the mean of its divisors is an integer number (39050541).

Almost surely, 2^78101081 is an apocalyptic number.

It is an amenable number.

78101081 is a deficient number, since it is larger than the sum of its proper divisors (1).

78101081 is an equidigital number, since it uses as much as digits as its factorization.

78101081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 78101081 is about 8837.4815982835. The cubic root of 78101081 is about 427.4503545737.

The spelling of 78101081 in words is "seventy-eight million, one hundred one thousand, eighty-one".