1312447421 has 2 divisors, whose sum is σ = 1312447422. Its totient is φ = 1312447420.

The previous prime is 1312447399. The next prime is 1312447441. The reversal of 1312447421 is 1247442131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 882921796 + 429525625 = 29714^2 + 20725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312447421 - 2¹⁰ = 1312446397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312447441) 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, 656223710 + 656223711.

It is an arithmetic number, because the mean of its divisors is an integer number (656223711).

Almost surely, 2^1312447421 is an apocalyptic number.

It is an amenable number.

1312447421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312447421 is an equidigital number, since it uses as much as digits as its factorization.

1312447421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 1312447421 is about 36227.7161990650. The cubic root of 1312447421 is about 1094.8651644125.

Adding to 1312447421 its reverse (1247442131), we get a palindrome (2559889552).

The spelling of 1312447421 in words is "one billion, three hundred twelve million, four hundred forty-seven thousand, four hundred twenty-one".