163951 has 4 divisors (see below), whose sum is σ = 172600. Its totient is φ = 155304.

The previous prime is 163927. The next prime is 163973. The reversal of 163951 is 159361.

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-163951 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4296 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (43150).

2¹⁶³⁹⁵¹ is an apocalyptic number.

163951 is a deficient number, since it is larger than the sum of its proper divisors (8649).

163951 is an equidigital number, since it uses as much as digits as its factorization.

163951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8648.

The product of its digits is 810, while the sum is 25.

The square root of 163951 is about 404.9086316689. The cubic root of 163951 is about 54.7315847521.

The spelling of 163951 in words is "one hundred sixty-three thousand, nine hundred fifty-one".