163871951 has 4 divisors (see below), whose sum is σ = 164006304. Its totient is φ = 163737600.

The previous prime is 163871909. The next prime is 163871971. The reversal of 163871951 is 159178361.

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 163871951 - 2¹⁸ = 163609807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163871899 and 163871908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163871971) 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, 65330 + ... + 67791.

It is an arithmetic number, because the mean of its divisors is an integer number (41001576).

Almost surely, 2^163871951 is an apocalyptic number.

163871951 is a deficient number, since it is larger than the sum of its proper divisors (134353).

163871951 is a wasteful number, since it uses less digits than its factorization.

163871951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134352.

The product of its digits is 45360, while the sum is 41.

The square root of 163871951 is about 12801.2480250951. The cubic root of 163871951 is about 547.2278705735.

The spelling of 163871951 in words is "one hundred sixty-three million, eight hundred seventy-one thousand, nine hundred fifty-one".