1291749707 has 2 divisors, whose sum is σ = 1291749708. Its totient is φ = 1291749706.

The previous prime is 1291749659. The next prime is 1291749737. The reversal of 1291749707 is 7079471921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291749707 - 2⁶ = 1291749643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291749737) 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, 645874853 + 645874854.

It is an arithmetic number, because the mean of its divisors is an integer number (645874854).

Almost surely, 2^1291749707 is an apocalyptic number.

1291749707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291749707 is an equidigital number, since it uses as much as digits as its factorization.

1291749707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 1291749707 is about 35940.9196738203. The cubic root of 1291749707 is about 1089.0791838903.

The spelling of 1291749707 in words is "one billion, two hundred ninety-one million, seven hundred forty-nine thousand, seven hundred seven".