863505161 has 4 divisors (see below), whose sum is σ = 863841024. Its totient is φ = 863169300.

The previous prime is 863505151. The next prime is 863505163. The reversal of 863505161 is 161505368.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 863505161 - 2²² = 859310857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863505163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164045 + ... + 169226.

It is an arithmetic number, because the mean of its divisors is an integer number (215960256).

Almost surely, 2^863505161 is an apocalyptic number.

It is an amenable number.

863505161 is a deficient number, since it is larger than the sum of its proper divisors (335863).

863505161 is a wasteful number, since it uses less digits than its factorization.

863505161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335862.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 863505161 is about 29385.4583255052. The cubic root of 863505161 is about 952.2587659128.

The spelling of 863505161 in words is "eight hundred sixty-three million, five hundred five thousand, one hundred sixty-one".