78225601 has 2 divisors, whose sum is σ = 78225602. Its totient is φ = 78225600.

The previous prime is 78225569. The next prime is 78225613. The reversal of 78225601 is 10652287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60078001 + 18147600 = 7751^2 + 4260^2 .

It is an emirp because it is prime and its reverse (10652287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78225601 - 2⁵ = 78225569 is a prime.

It is a super-2 number, since 2×78225601² = 12238489303622402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78225671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39112800 + 39112801.

It is an arithmetic number, because the mean of its divisors is an integer number (39112801).

Almost surely, 2^78225601 is an apocalyptic number.

It is an amenable number.

78225601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78225601 is an equidigital number, since it uses as much as digits as its factorization.

78225601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 78225601 is about 8844.5237859367. The cubic root of 78225601 is about 427.6774016072.

Adding to 78225601 its reverse (10652287), we get a palindrome (88877888).

The spelling of 78225601 in words is "seventy-eight million, two hundred twenty-five thousand, six hundred one".