1291106923 has 2 divisors, whose sum is σ = 1291106924. Its totient is φ = 1291106922.

The previous prime is 1291106881. The next prime is 1291106953. The reversal of 1291106923 is 3296011921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291106923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291106953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645553461 + 645553462.

It is an arithmetic number, because the mean of its divisors is an integer number (645553462).

Almost surely, 2^1291106923 is an apocalyptic number.

1291106923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291106923 is an equidigital number, since it uses as much as digits as its factorization.

1291106923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1291106923 is about 35931.9763302828. The cubic root of 1291106923 is about 1088.8985093582.

The spelling of 1291106923 in words is "one billion, two hundred ninety-one million, one hundred six thousand, nine hundred twenty-three".