163571997 has 4 divisors (see below), whose sum is σ = 218096000. Its totient is φ = 109047996.

The previous prime is 163571987. The next prime is 163572119. The reversal of 163571997 is 799175361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 163571997 - 2⁴ = 163571981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163571987) 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, 27261997 + ... + 27262002.

It is an arithmetic number, because the mean of its divisors is an integer number (54524000).

Almost surely, 2^163571997 is an apocalyptic number.

It is an amenable number.

163571997 is a deficient number, since it is larger than the sum of its proper divisors (54524003).

163571997 is an equidigital number, since it uses as much as digits as its factorization.

163571997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54524002.

The product of its digits is 357210, while the sum is 48.

The square root of 163571997 is about 12789.5268481676. The cubic root of 163571997 is about 546.8937815895.

The spelling of 163571997 in words is "one hundred sixty-three million, five hundred seventy-one thousand, nine hundred ninety-seven".