1297805543 has 2 divisors, whose sum is σ = 1297805544. Its totient is φ = 1297805542.

The previous prime is 1297805519. The next prime is 1297805563. The reversal of 1297805543 is 3455087921.

It is a strong prime.

It is an emirp because it is prime and its reverse (3455087921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1297805543 - 2¹⁶ = 1297740007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1297805494 and 1297805503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297805563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648902771 + 648902772.

It is an arithmetic number, because the mean of its divisors is an integer number (648902772).

Almost surely, 2^1297805543 is an apocalyptic number.

1297805543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297805543 is an equidigital number, since it uses as much as digits as its factorization.

1297805543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 1297805543 is about 36025.0682580894. The cubic root of 1297805543 is about 1090.7784308439.

The spelling of 1297805543 in words is "one billion, two hundred ninety-seven million, eight hundred five thousand, five hundred forty-three".