1312498721 has 2 divisors, whose sum is σ = 1312498722. Its totient is φ = 1312498720.

The previous prime is 1312498717. The next prime is 1312498727. The reversal of 1312498721 is 1278942131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071907600 + 240591121 = 32740^2 + 15511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312498721 - 2² = 1312498717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1312498727) 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, 656249360 + 656249361.

It is an arithmetic number, because the mean of its divisors is an integer number (656249361).

Almost surely, 2^1312498721 is an apocalyptic number.

It is an amenable number.

1312498721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312498721 is an equidigital number, since it uses as much as digits as its factorization.

1312498721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 1312498721 is about 36228.4242135923. The cubic root of 1312498721 is about 1094.8794293271.

The spelling of 1312498721 in words is "one billion, three hundred twelve million, four hundred ninety-eight thousand, seven hundred twenty-one".