168280993 has 2 divisors, whose sum is σ = 168280994. Its totient is φ = 168280992.

The previous prime is 168280991. The next prime is 168281021. The reversal of 168280993 is 399082861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99440784 + 68840209 = 9972^2 + 8297^2 .

It is a cyclic number.

It is not a de Polignac number, because 168280993 - 2¹ = 168280991 is a prime.

Together with 168280991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (168280991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84140496 + 84140497.

It is an arithmetic number, because the mean of its divisors is an integer number (84140497).

Almost surely, 2^168280993 is an apocalyptic number.

It is an amenable number.

168280993 is a deficient number, since it is larger than the sum of its proper divisors (1).

168280993 is an equidigital number, since it uses as much as digits as its factorization.

168280993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 168280993 is about 12972.3164084137. The cubic root of 168280993 is about 552.0922981996.

The spelling of 168280993 in words is "one hundred sixty-eight million, two hundred eighty thousand, nine hundred ninety-three".