1993808897 has 2 divisors, whose sum is σ = 1993808898. Its totient is φ = 1993808896.

The previous prime is 1993808879. The next prime is 1993808959. The reversal of 1993808897 is 7988083991.

Together with previous prime (1993808879) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (1993808959) can be obtained adding 1993808897 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1625783041 + 368025856 = 40321^2 + 19184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993808897 - 2²² = 1989614593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1993868897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996904448 + 996904449.

It is an arithmetic number, because the mean of its divisors is an integer number (996904449).

Almost surely, 2^1993808897 is an apocalyptic number.

It is an amenable number.

1993808897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993808897 is an equidigital number, since it uses as much as digits as its factorization.

1993808897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The square root of 1993808897 is about 44652.0872636431. The cubic root of 1993808897 is about 1258.6196559604.

The spelling of 1993808897 in words is "one billion, nine hundred ninety-three million, eight hundred eight thousand, eight hundred ninety-seven".