1312021049 has 2 divisors, whose sum is σ = 1312021050. Its totient is φ = 1312021048.

The previous prime is 1312021037. The next prime is 1312021069. The reversal of 1312021049 is 9401202131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1285939600 + 26081449 = 35860^2 + 5107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312021049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312021069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656010524 + 656010525.

It is an arithmetic number, because the mean of its divisors is an integer number (656010525).

Almost surely, 2^1312021049 is an apocalyptic number.

It is an amenable number.

1312021049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312021049 is an equidigital number, since it uses as much as digits as its factorization.

1312021049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1312021049 is about 36221.8311105333. The cubic root of 1312021049 is about 1094.7465893993.

The spelling of 1312021049 in words is "one billion, three hundred twelve million, twenty-one thousand, forty-nine".