1291240503 has 18 divisors (see below), whose sum is σ = 2169636144. Its totient is φ = 737851464.

The previous prime is 1291240501. The next prime is 1291240529. The reversal of 1291240503 is 3050421921.

It is not a de Polignac number, because 1291240503 - 2¹ = 1291240501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291240501) 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 in 17 ways as a sum of consecutive naturals, for example, 1463551 + ... + 1464432.

Almost surely, 2^1291240503 is an apocalyptic number.

1291240503 is a deficient number, since it is larger than the sum of its proper divisors (878395641).

1291240503 is a wasteful number, since it uses less digits than its factorization.

1291240503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928003 (or 2927993 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1291240503 is about 35933.8350722547. The cubic root of 1291240503 is about 1088.9360611272.

The spelling of 1291240503 in words is "one billion, two hundred ninety-one million, two hundred forty thousand, five hundred three".