1312455409 has 2 divisors, whose sum is σ = 1312455410. Its totient is φ = 1312455408.

The previous prime is 1312455373. The next prime is 1312455421. The reversal of 1312455409 is 9045542131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311888400 + 567009 = 36220^2 + 753^2 .

It is an emirp because it is prime and its reverse (9045542131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312455409 - 2¹¹ = 1312453361 is a prime.

It is a super-2 number, since 2×1312455409² = 3445078401226714562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312435409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656227704 + 656227705.

It is an arithmetic number, because the mean of its divisors is an integer number (656227705).

Almost surely, 2^1312455409 is an apocalyptic number.

It is an amenable number.

1312455409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312455409 is an equidigital number, since it uses as much as digits as its factorization.

1312455409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1312455409 is about 36227.8264459793. The cubic root of 1312455409 is about 1094.8673856482.

The spelling of 1312455409 in words is "one billion, three hundred twelve million, four hundred fifty-five thousand, four hundred nine".