1291749959 has 2 divisors, whose sum is σ = 1291749960. Its totient is φ = 1291749958.

The previous prime is 1291749937. The next prime is 1291749961. The reversal of 1291749959 is 9599471921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291749959 - 2¹⁶ = 1291684423 is a prime.

Together with 1291749961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291749919) 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, 645874979 + 645874980.

It is an arithmetic number, because the mean of its divisors is an integer number (645874980).

Almost surely, 2^1291749959 is an apocalyptic number.

1291749959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291749959 is an equidigital number, since it uses as much as digits as its factorization.

1291749959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 56.

The square root of 1291749959 is about 35940.9231795734. The cubic root of 1291749959 is about 1089.0792547110.

The spelling of 1291749959 in words is "one billion, two hundred ninety-one million, seven hundred forty-nine thousand, nine hundred fifty-nine".