2543347861 has 2 divisors, whose sum is σ = 2543347862. Its totient is φ = 2543347860.

The previous prime is 2543347853. The next prime is 2543347907. The reversal of 2543347861 is 1687433452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345495761 + 1197852100 = 36681^2 + 34610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543347861 - 2³ = 2543347853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2543347811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271673930 + 1271673931.

It is an arithmetic number, because the mean of its divisors is an integer number (1271673931).

Almost surely, 2^2543347861 is an apocalyptic number.

It is an amenable number.

2543347861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543347861 is an equidigital number, since it uses as much as digits as its factorization.

2543347861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 43.

The square root of 2543347861 is about 50431.6156889703. The cubic root of 2543347861 is about 1365.0081821798.

The spelling of 2543347861 in words is "two billion, five hundred forty-three million, three hundred forty-seven thousand, eight hundred sixty-one".