163151321 has 4 divisors (see below), whose sum is σ = 164595252. Its totient is φ = 161707392.

The previous prime is 163151311. The next prime is 163151323. The reversal of 163151321 is 123151361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20611600 + 142539721 = 4540^2 + 11939^2 .

It is a cyclic number.

It is not a de Polignac number, because 163151321 - 2⁶ = 163151257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163151323) 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, 721796 + ... + 722021.

It is an arithmetic number, because the mean of its divisors is an integer number (41148813).

Almost surely, 2^163151321 is an apocalyptic number.

It is an amenable number.

163151321 is a deficient number, since it is larger than the sum of its proper divisors (1443931).

163151321 is a wasteful number, since it uses less digits than its factorization.

163151321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443930.

The product of its digits is 540, while the sum is 23.

The square root of 163151321 is about 12773.0701477757. The cubic root of 163151321 is about 546.4245435724.

The spelling of 163151321 in words is "one hundred sixty-three million, one hundred fifty-one thousand, three hundred twenty-one".