78110401 has 2 divisors, whose sum is σ = 78110402. Its totient is φ = 78110400.

The previous prime is 78110377. The next prime is 78110429. The reversal of 78110401 is 10401187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76108176 + 2002225 = 8724^2 + 1415^2 .

It is an emirp because it is prime and its reverse (10401187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78110401 - 2¹⁵ = 78077633 is a prime.

It is a super-2 number, since 2×78110401² = 12202469488761602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78110701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39055200 + 39055201.

It is an arithmetic number, because the mean of its divisors is an integer number (39055201).

Almost surely, 2^78110401 is an apocalyptic number.

It is an amenable number.

78110401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78110401 is an equidigital number, since it uses as much as digits as its factorization.

78110401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 78110401 is about 8838.0088820956. The cubic root of 78110401 is about 427.4673568089.

Adding to 78110401 its reverse (10401187), we get a palindrome (88511588).

The spelling of 78110401 in words is "seventy-eight million, one hundred ten thousand, four hundred one".