1312221439 has 2 divisors, whose sum is σ = 1312221440. Its totient is φ = 1312221438.

The previous prime is 1312221433. The next prime is 1312221479. The reversal of 1312221439 is 9341222131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312221439 - 2⁷ = 1312221311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312221433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656110719 + 656110720.

It is an arithmetic number, because the mean of its divisors is an integer number (656110720).

Almost surely, 2^1312221439 is an apocalyptic number.

1312221439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312221439 is an equidigital number, since it uses as much as digits as its factorization.

1312221439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 1312221439 is about 36224.5971544198. The cubic root of 1312221439 is about 1094.8023215086.

The spelling of 1312221439 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, four hundred thirty-nine".