1291912607 has 2 divisors, whose sum is σ = 1291912608. Its totient is φ = 1291912606.

The previous prime is 1291912591. The next prime is 1291912613. The reversal of 1291912607 is 7062191921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291912607 - 2⁴ = 1291912591 is a prime.

It is a super-3 number, since 3×1291912607³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291912627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645956303 + 645956304.

It is an arithmetic number, because the mean of its divisors is an integer number (645956304).

Almost surely, 2^1291912607 is an apocalyptic number.

1291912607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291912607 is an equidigital number, since it uses as much as digits as its factorization.

1291912607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1291912607 is about 35943.1858215156. The cubic root of 1291912607 is about 1089.1249625064.

The spelling of 1291912607 in words is "one billion, two hundred ninety-one million, nine hundred twelve thousand, six hundred seven".