78071401 has 2 divisors, whose sum is σ = 78071402. Its totient is φ = 78071400.

The previous prime is 78071363. The next prime is 78071419. The reversal of 78071401 is 10417087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62031376 + 16040025 = 7876^2 + 4005^2 .

It is an emirp because it is prime and its reverse (10417087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78071401 - 2¹¹ = 78069353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78071401.

It is not a weakly prime, because it can be changed into another prime (78071431) 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, 39035700 + 39035701.

It is an arithmetic number, because the mean of its divisors is an integer number (39035701).

Almost surely, 2^78071401 is an apocalyptic number.

It is an amenable number.

78071401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78071401 is an equidigital number, since it uses as much as digits as its factorization.

78071401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 78071401 is about 8835.8022273023. The cubic root of 78071401 is about 427.3962011025.

Adding to 78071401 its reverse (10417087), we get a palindrome (88488488).

The spelling of 78071401 in words is "seventy-eight million, seventy-one thousand, four hundred one".