863161993 has 2 divisors, whose sum is σ = 863161994. Its totient is φ = 863161992.

The previous prime is 863161987. The next prime is 863161997. The reversal of 863161993 is 399161368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819562384 + 43599609 = 28628^2 + 6603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863161993 is a prime.

It is not a weakly prime, because it can be changed into another prime (863161997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431580996 + 431580997.

It is an arithmetic number, because the mean of its divisors is an integer number (431580997).

Almost surely, 2^863161993 is an apocalyptic number.

It is an amenable number.

863161993 is a deficient number, since it is larger than the sum of its proper divisors (1).

863161993 is an equidigital number, since it uses as much as digits as its factorization.

863161993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 863161993 is about 29379.6186666880. The cubic root of 863161993 is about 952.1326025923.

The spelling of 863161993 in words is "eight hundred sixty-three million, one hundred sixty-one thousand, nine hundred ninety-three".