2126555969 has 2 divisors, whose sum is σ = 2126555970. Its totient is φ = 2126555968.

The previous prime is 2126555957. The next prime is 2126555971. The reversal of 2126555969 is 9695556212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1577122369 + 549433600 = 39713^2 + 23440^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126555969 - 2²⁰ = 2125507393 is a prime.

It is a super-2 number, since 2×2126555969² = 9044480578579057922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2126555971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2126555999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063277984 + 1063277985.

It is an arithmetic number, because the mean of its divisors is an integer number (1063277985).

Almost surely, 2^2126555969 is an apocalyptic number.

It is an amenable number.

2126555969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126555969 is an equidigital number, since it uses as much as digits as its factorization.

2126555969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 50.

The square root of 2126555969 is about 46114.5960515757. The cubic root of 2126555969 is about 1285.9545097091.

The spelling of 2126555969 in words is "two billion, one hundred twenty-six million, five hundred fifty-five thousand, nine hundred sixty-nine".