13771772197 has 2 divisors, whose sum is σ = 13771772198. Its totient is φ = 13771772196.

The previous prime is 13771772173. The next prime is 13771772237. The reversal of 13771772197 is 79127717731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13267814596 + 503957601 = 115186^2 + 22449^2 .

It is a cyclic number.

It is not a de Polignac number, because 13771772197 - 2¹¹ = 13771770149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13771770197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6885886098 + 6885886099.

It is an arithmetic number, because the mean of its divisors is an integer number (6885886099).

Almost surely, 2^13771772197 is an apocalyptic number.

It is an amenable number.

13771772197 is a deficient number, since it is larger than the sum of its proper divisors (1).

13771772197 is an equidigital number, since it uses as much as digits as its factorization.

13771772197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907578, while the sum is 52.

The spelling of 13771772197 in words is "thirteen billion, seven hundred seventy-one million, seven hundred seventy-two thousand, one hundred ninety-seven".