814556993 has 2 divisors, whose sum is σ = 814556994. Its totient is φ = 814556992.

The previous prime is 814556987. The next prime is 814557043. The reversal of 814556993 is 399655418.

It is a happy number.

It is an a-pointer prime, because the next prime (814557043) can be obtained adding 814556993 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 773507344 + 41049649 = 27812^2 + 6407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-814556993 is a prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407278496 + 407278497.

It is an arithmetic number, because the mean of its divisors is an integer number (407278497).

Almost surely, 2^814556993 is an apocalyptic number.

It is an amenable number.

814556993 is a deficient number, since it is larger than the sum of its proper divisors (1).

814556993 is an equidigital number, since it uses as much as digits as its factorization.

814556993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 50.

The square root of 814556993 is about 28540.4448633864. Note that the first 3 decimals coincide. The cubic root of 814556993 is about 933.9145870719.

The spelling of 814556993 in words is "eight hundred fourteen million, five hundred fifty-six thousand, nine hundred ninety-three".