1312221049 has 2 divisors, whose sum is σ = 1312221050. Its totient is φ = 1312221048.

The previous prime is 1312221019. The next prime is 1312221061. The reversal of 1312221049 is 9401222131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121781049 + 190440000 = 33493^2 + 13800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312221049 - 2¹⁵ = 1312188281 is a prime.

It is a super-3 number, since 3×1312221049³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1312221019) 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, 656110524 + 656110525.

It is an arithmetic number, because the mean of its divisors is an integer number (656110525).

Almost surely, 2^1312221049 is an apocalyptic number.

It is an amenable number.

1312221049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312221049 is an equidigital number, since it uses as much as digits as its factorization.

1312221049 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 1312221049 is about 36224.5917713368. The cubic root of 1312221049 is about 1094.8022130480.

The spelling of 1312221049 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, forty-nine".