169221197 has 4 divisors (see below), whose sum is σ = 172821696. Its totient is φ = 165620700.

The previous prime is 169221193. The next prime is 169221203. The reversal of 169221197 is 791122961.

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 a cyclic number.

It is not a de Polignac number, because 169221197 - 2² = 169221193 is a prime.

It is a super-2 number, since 2×169221197² = 57271627028225618, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 169221197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169221193) 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, 1800179 + ... + 1800272.

It is an arithmetic number, because the mean of its divisors is an integer number (43205424).

Almost surely, 2^169221197 is an apocalyptic number.

It is an amenable number.

169221197 is a deficient number, since it is larger than the sum of its proper divisors (3600499).

169221197 is an equidigital number, since it uses as much as digits as its factorization.

169221197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600498.

The product of its digits is 13608, while the sum is 38.

The square root of 169221197 is about 13008.5047949409. The cubic root of 169221197 is about 553.1185889093.

The spelling of 169221197 in words is "one hundred sixty-nine million, two hundred twenty-one thousand, one hundred ninety-seven".