163865971 has 8 divisors (see below), whose sum is σ = 168084000. Its totient is φ = 159658560.

The previous prime is 163865963. The next prime is 163865981. The reversal of 163865971 is 179568361.

It is a happy number.

163865971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163865971 - 2³ = 163865963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163865981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35505 + ... + 39853.

It is an arithmetic number, because the mean of its divisors is an integer number (21010500).

Almost surely, 2^163865971 is an apocalyptic number.

163865971 is a deficient number, since it is larger than the sum of its proper divisors (4218029).

163865971 is an equidigital number, since it uses as much as digits as its factorization.

163865971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309.

The product of its digits is 272160, while the sum is 46.

The square root of 163865971 is about 12801.0144519878. The cubic root of 163865971 is about 547.2212140296.

It can be divided in two parts, 163865 and 971, that added together give a square (164836 = 406²).

The spelling of 163865971 in words is "one hundred sixty-three million, eight hundred sixty-five thousand, nine hundred seventy-one".