1291542503 has 2 divisors, whose sum is σ = 1291542504. Its totient is φ = 1291542502.

The previous prime is 1291542443. The next prime is 1291542541. The reversal of 1291542503 is 3052451921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291542503 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291542503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291542583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645771251 + 645771252.

It is an arithmetic number, because the mean of its divisors is an integer number (645771252).

Almost surely, 2^1291542503 is an apocalyptic number.

1291542503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291542503 is an equidigital number, since it uses as much as digits as its factorization.

1291542503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1291542503 is about 35938.0369942489. The cubic root of 1291542503 is about 1089.0209492780.

The spelling of 1291542503 in words is "one billion, two hundred ninety-one million, five hundred forty-two thousand, five hundred three".