2147561243 has 2 divisors, whose sum is σ = 2147561244. Its totient is φ = 2147561242.

The previous prime is 2147561209. The next prime is 2147561291. The reversal of 2147561243 is 3421657412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2147561243 - 2⁶ = 2147561179 is a prime.

It is a super-2 number, since 2×2147561243² = 9224038584871410098, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2147560243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073780621 + 1073780622.

It is an arithmetic number, because the mean of its divisors is an integer number (1073780622).

Almost surely, 2^2147561243 is an apocalyptic number.

2147561243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147561243 is an equidigital number, since it uses as much as digits as its factorization.

2147561243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 2147561243 is about 46341.7872227647. The cubic root of 2147561243 is about 1290.1746940068.

The spelling of 2147561243 in words is "two billion, one hundred forty-seven million, five hundred sixty-one thousand, two hundred forty-three".