1291449403 has 2 divisors, whose sum is σ = 1291449404. Its totient is φ = 1291449402.

The previous prime is 1291449377. The next prime is 1291449413. The reversal of 1291449403 is 3049441921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291449403 - 2¹³ = 1291441211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291449413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645724701 + 645724702.

It is an arithmetic number, because the mean of its divisors is an integer number (645724702).

Almost surely, 2^1291449403 is an apocalyptic number.

1291449403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291449403 is an equidigital number, since it uses as much as digits as its factorization.

1291449403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1291449403 is about 35936.7416859125. The cubic root of 1291449403 is about 1088.9947815273.

The spelling of 1291449403 in words is "one billion, two hundred ninety-one million, four hundred forty-nine thousand, four hundred three".