12778201 has 2 divisors, whose sum is σ = 12778202. Its totient is φ = 12778200.

The previous prime is 12778189. The next prime is 12778229. The reversal of 12778201 is 10287721.

It is an a-pointer prime, because the next prime (12778229) can be obtained adding 12778201 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11048976 + 1729225 = 3324^2 + 1315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12778201.

It is not a weakly prime, because it can be changed into another prime (12778291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389100 + 6389101.

It is an arithmetic number, because the mean of its divisors is an integer number (6389101).

Almost surely, 2^12778201 is an apocalyptic number.

It is an amenable number.

12778201 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778201 is an equidigital number, since it uses as much as digits as its factorization.

12778201 is an evil number, because the sum of its binary digits is even.

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

The square root of 12778201 is about 3574.6609629446. The cubic root of 12778201 is about 233.7885505541.

The spelling of 12778201 in words is "twelve million, seven hundred seventy-eight thousand, two hundred one".