163881287 has 4 divisors (see below), whose sum is σ = 165503976. Its totient is φ = 162258600.

The previous prime is 163881269. The next prime is 163881323. The reversal of 163881287 is 782188361.

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 163881287 - 2²⁰ = 162832711 is a prime.

It is a super-3 number, since 3×163881287³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163881257) 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, 811193 + ... + 811394.

It is an arithmetic number, because the mean of its divisors is an integer number (41375994).

Almost surely, 2^163881287 is an apocalyptic number.

163881287 is a deficient number, since it is larger than the sum of its proper divisors (1622689).

163881287 is a wasteful number, since it uses less digits than its factorization.

163881287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622688.

The product of its digits is 129024, while the sum is 44.

The square root of 163881287 is about 12801.6126718472. The cubic root of 163881287 is about 547.2382624726.

The spelling of 163881287 in words is "one hundred sixty-three million, eight hundred eighty-one thousand, two hundred eighty-seven".