1281457613 has 2 divisors, whose sum is σ = 1281457614. Its totient is φ = 1281457612.

The previous prime is 1281457607. The next prime is 1281457621. The reversal of 1281457613 is 3167541821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276061284 + 5396329 = 35722^2 + 2323^2 .

It is an emirp because it is prime and its reverse (3167541821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1281457613 - 2⁸ = 1281457357 is a prime.

It is a super-2 number, since 2×1281457613² = 3284267227831315538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281157613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640728806 + 640728807.

It is an arithmetic number, because the mean of its divisors is an integer number (640728807).

Almost surely, 2^1281457613 is an apocalyptic number.

It is an amenable number.

1281457613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281457613 is an equidigital number, since it uses as much as digits as its factorization.

1281457613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 1281457613 is about 35797.4526048991. The cubic root of 1281457613 is about 1086.1790330435.

The spelling of 1281457613 in words is "one billion, two hundred eighty-one million, four hundred fifty-seven thousand, six hundred thirteen".