1291831523 has 2 divisors, whose sum is σ = 1291831524. Its totient is φ = 1291831522.

The previous prime is 1291831493. The next prime is 1291831531. The reversal of 1291831523 is 3251381921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291831523 - 2¹⁶ = 1291765987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291831543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645915761 + 645915762.

It is an arithmetic number, because the mean of its divisors is an integer number (645915762).

Almost surely, 2^1291831523 is an apocalyptic number.

1291831523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291831523 is an equidigital number, since it uses as much as digits as its factorization.

1291831523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 1291831523 is about 35942.0578570565. The cubic root of 1291831523 is about 1089.1021765338.

The spelling of 1291831523 in words is "one billion, two hundred ninety-one million, eight hundred thirty-one thousand, five hundred twenty-three".