1311021449 has 2 divisors, whose sum is σ = 1311021450. Its totient is φ = 1311021448.

The previous prime is 1311021427. The next prime is 1311021463. The reversal of 1311021449 is 9441201131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 791409424 + 519612025 = 28132^2 + 22795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311021449 - 2⁸ = 1311021193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311021469) 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, 655510724 + 655510725.

It is an arithmetic number, because the mean of its divisors is an integer number (655510725).

Almost surely, 2^1311021449 is an apocalyptic number.

It is an amenable number.

1311021449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311021449 is an equidigital number, since it uses as much as digits as its factorization.

1311021449 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 26.

The square root of 1311021449 is about 36208.0301728774. The cubic root of 1311021449 is about 1094.4684976418.

The spelling of 1311021449 in words is "one billion, three hundred eleven million, twenty-one thousand, four hundred forty-nine".