1249555543 has 2 divisors, whose sum is σ = 1249555544. Its totient is φ = 1249555542.

The previous prime is 1249555519. The next prime is 1249555547. The reversal of 1249555543 is 3455559421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1249555543 - 2⁹ = 1249555031 is a prime.

It is a super-2 number, since 2×1249555543² = 3122778110084049698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1249555543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249555547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624777771 + 624777772.

It is an arithmetic number, because the mean of its divisors is an integer number (624777772).

Almost surely, 2^1249555543 is an apocalyptic number.

1249555543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249555543 is an equidigital number, since it uses as much as digits as its factorization.

1249555543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540000, while the sum is 43.

The square root of 1249555543 is about 35349.0529293219. The cubic root of 1249555543 is about 1077.0896560703.

The spelling of 1249555543 in words is "one billion, two hundred forty-nine million, five hundred fifty-five thousand, five hundred forty-three".