1291920677 has 2 divisors, whose sum is σ = 1291920678. Its totient is φ = 1291920676.

The previous prime is 1291920671. The next prime is 1291920683. The reversal of 1291920677 is 7760291921.

It is a balanced prime because it is at equal distance from previous prime (1291920671) and next prime (1291920683).

It can be written as a sum of positive squares in only one way, i.e., 1280637796 + 11282881 = 35786^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291920677 - 2⁶ = 1291920613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291920671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645960338 + 645960339.

It is an arithmetic number, because the mean of its divisors is an integer number (645960339).

Almost surely, 2^1291920677 is an apocalyptic number.

It is an amenable number.

1291920677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291920677 is an equidigital number, since it uses as much as digits as its factorization.

1291920677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1291920677 is about 35943.2980818400. The cubic root of 1291920677 is about 1089.1272302605.

The spelling of 1291920677 in words is "one billion, two hundred ninety-one million, nine hundred twenty thousand, six hundred seventy-seven".