1308256993 has 2 divisors, whose sum is σ = 1308256994. Its totient is φ = 1308256992.

The previous prime is 1308256991. The next prime is 1308257003. The reversal of 1308256993 is 3996528031.

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., 1286513424 + 21743569 = 35868^2 + 4663^2 .

It is an emirp because it is prime and its reverse (3996528031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1308256993 - 2¹ = 1308256991 is a prime.

Together with 1308256991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1308256991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654128496 + 654128497.

It is an arithmetic number, because the mean of its divisors is an integer number (654128497).

Almost surely, 2^1308256993 is an apocalyptic number.

It is an amenable number.

1308256993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1308256993 is an equidigital number, since it uses as much as digits as its factorization.

1308256993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 1308256993 is about 36169.8354018926. The cubic root of 1308256993 is about 1093.6986808117.

The spelling of 1308256993 in words is "one billion, three hundred eight million, two hundred fifty-six thousand, nine hundred ninety-three".