2778197 has 2 divisors, whose sum is σ = 2778198. Its totient is φ = 2778196.

The previous prime is 2778173. The next prime is 2778203. The reversal of 2778197 is 7918772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2669956 + 108241 = 1634^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778197 - 2²⁰ = 1729621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389098 + 1389099.

It is an arithmetic number, because the mean of its divisors is an integer number (1389099).

2^2778197 is an apocalyptic number.

It is an amenable number.

2778197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778197 is an equidigital number, since it uses as much as digits as its factorization.

2778197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 41.

The square root of 2778197 is about 1666.7924285885. The cubic root of 2778197 is about 140.5791822422.

The spelling of 2778197 in words is "two million, seven hundred seventy-eight thousand, one hundred ninety-seven".