1291104403 has 2 divisors, whose sum is σ = 1291104404. Its totient is φ = 1291104402.

The previous prime is 1291104401. The next prime is 1291104407. The reversal of 1291104403 is 3044011921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291104403 - 2¹ = 1291104401 is a prime.

Together with 1291104401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1291104401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645552201 + 645552202.

It is an arithmetic number, because the mean of its divisors is an integer number (645552202).

Almost surely, 2^1291104403 is an apocalyptic number.

1291104403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291104403 is an equidigital number, since it uses as much as digits as its factorization.

1291104403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1291104403 is about 35931.9412640063. The cubic root of 1291104403 is about 1088.8978009155.

The spelling of 1291104403 in words is "one billion, two hundred ninety-one million, one hundred four thousand, four hundred three".