163956215 has 4 divisors (see below), whose sum is σ = 196747464. Its totient is φ = 131164968.

The previous prime is 163956209. The next prime is 163956217. The reversal of 163956215 is 512659361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163956215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163956217) 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, 16395617 + ... + 16395626.

It is an arithmetic number, because the mean of its divisors is an integer number (49186866).

Almost surely, 2^163956215 is an apocalyptic number.

163956215 is a deficient number, since it is larger than the sum of its proper divisors (32791249).

163956215 is an equidigital number, since it uses as much as digits as its factorization.

163956215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32791248.

The product of its digits is 48600, while the sum is 38.

The square root of 163956215 is about 12804.5388437069. The cubic root of 163956215 is about 547.3216505190.

The spelling of 163956215 in words is "one hundred sixty-three million, nine hundred fifty-six thousand, two hundred fifteen".