3197778121 has 2 divisors, whose sum is σ = 3197778122. Its totient is φ = 3197778120.

The previous prime is 3197778097. The next prime is 3197778131. The reversal of 3197778121 is 1218777913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3053778121 + 144000000 = 55261^2 + 12000^2 .

It is an emirp because it is prime and its reverse (1218777913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3197778121 - 2¹³ = 3197769929 is a prime.

It is a super-2 number, since 2×3197778121² = 20451569822292581282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3197778131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1598889060 + 1598889061.

It is an arithmetic number, because the mean of its divisors is an integer number (1598889061).

Almost surely, 2^3197778121 is an apocalyptic number.

It is an amenable number.

3197778121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3197778121 is an equidigital number, since it uses as much as digits as its factorization.

3197778121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 46.

The square root of 3197778121 is about 56548.9002634003. The cubic root of 3197778121 is about 1473.2714591459.

The spelling of 3197778121 in words is "three billion, one hundred ninety-seven million, seven hundred seventy-eight thousand, one hundred twenty-one".