1249603543 has 2 divisors, whose sum is σ = 1249603544. Its totient is φ = 1249603542.

The previous prime is 1249603541. The next prime is 1249603559. The reversal of 1249603543 is 3453069421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1249603543 - 2¹ = 1249603541 is a prime.

Together with 1249603541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249603541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624801771 + 624801772.

It is an arithmetic number, because the mean of its divisors is an integer number (624801772).

Almost surely, 2^1249603543 is an apocalyptic number.

1249603543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249603543 is an equidigital number, since it uses as much as digits as its factorization.

1249603543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1249603543 is about 35349.7318660269. The cubic root of 1249603543 is about 1077.1034475451.

The spelling of 1249603543 in words is "one billion, two hundred forty-nine million, six hundred three thousand, five hundred forty-three".