5211643561 has 2 divisors, whose sum is σ = 5211643562. Its totient is φ = 5211643560.

The previous prime is 5211643553. The next prime is 5211643571. The reversal of 5211643561 is 1653461125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2957293161 + 2254350400 = 54381^2 + 47480^2 .

It is a cyclic number.

It is not a de Polignac number, because 5211643561 - 2³ = 5211643553 is a prime.

It is a super-2 number, since 2×5211643561² = 54322457213825521442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5211643571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605821780 + 2605821781.

It is an arithmetic number, because the mean of its divisors is an integer number (2605821781).

Almost surely, 2^5211643561 is an apocalyptic number.

It is an amenable number.

5211643561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211643561 is an equidigital number, since it uses as much as digits as its factorization.

5211643561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 5211643561 is about 72191.7139358805. The cubic root of 5211643561 is about 1733.7703374926.

The spelling of 5211643561 in words is "five billion, two hundred eleven million, six hundred forty-three thousand, five hundred sixty-one".