163782381 has 16 divisors (see below), whose sum is σ = 249885824. Its totient is φ = 93472704.

The previous prime is 163782361. The next prime is 163782383. The reversal of 163782381 is 183287361.

It is a de Polignac number, because none of the positive numbers 2^k-163782381 is a prime.

It is a super-2 number, since 2×163782381² = 53649336652058322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163782383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13971 + ... + 22863.

It is an arithmetic number, because the mean of its divisors is an integer number (15617864).

Almost surely, 2^163782381 is an apocalyptic number.

It is an amenable number.

163782381 is a deficient number, since it is larger than the sum of its proper divisors (86103443).

163782381 is an equidigital number, since it uses as much as digits as its factorization.

163782381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9780.

The product of its digits is 48384, while the sum is 39.

The square root of 163782381 is about 12797.7490598933. The cubic root of 163782381 is about 547.1281501655.

The spelling of 163782381 in words is "one hundred sixty-three million, seven hundred eighty-two thousand, three hundred eighty-one".