163506331 has 4 divisors (see below), whose sum is σ = 165946792. Its totient is φ = 161065872.

The previous prime is 163506283. The next prime is 163506337. The reversal of 163506331 is 133605361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163506331 - 2¹⁷ = 163375259 is a prime.

It is a super-2 number, since 2×163506331² = 53468640554163122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163506331.

It is not an unprimeable number, because it can be changed into a prime (163506337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220130 + ... + 1220263.

It is an arithmetic number, because the mean of its divisors is an integer number (41486698).

Almost surely, 2^163506331 is an apocalyptic number.

163506331 is a deficient number, since it is larger than the sum of its proper divisors (2440461).

163506331 is an equidigital number, since it uses as much as digits as its factorization.

163506331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440460.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 163506331 is about 12786.9594118383. The cubic root of 163506331 is about 546.8205882670.

The spelling of 163506331 in words is "one hundred sixty-three million, five hundred six thousand, three hundred thirty-one".