163256417 has 4 divisors (see below), whose sum is σ = 171848880. Its totient is φ = 154663956.

The previous prime is 163256407. The next prime is 163256437. The reversal of 163256417 is 714652361.

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 a de Polignac number, because none of the positive numbers 2^k-163256417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163256407) 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, 4296203 + ... + 4296240.

It is an arithmetic number, because the mean of its divisors is an integer number (42962220).

Almost surely, 2^163256417 is an apocalyptic number.

It is an amenable number.

163256417 is a deficient number, since it is larger than the sum of its proper divisors (8592463).

163256417 is an equidigital number, since it uses as much as digits as its factorization.

163256417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8592462.

The product of its digits is 30240, while the sum is 35.

The square root of 163256417 is about 12777.1834533280. The cubic root of 163256417 is about 546.5418471633.

The spelling of 163256417 in words is "one hundred sixty-three million, two hundred fifty-six thousand, four hundred seventeen".