169959132121 has 9 divisors (see below), whose sum is σ = 172066145461. Its totient is φ = 167877626332.

The previous prime is 169959132073. The next prime is 169959132131. The reversal of 169959132121 is 121231959961.

The square root of 169959132121 is 412261.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 169959132121 - 2²⁷ = 169824914393 is a prime.

It is a super-2 number, since 2×169959132121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169959132131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34215180 + ... + 34220146.

Almost surely, 2^169959132121 is an apocalyptic number.

169959132121 is the 412261-st square number.

169959132121 is the 206131-st centered octagonal number.

It is an amenable number.

169959132121 is a deficient number, since it is larger than the sum of its proper divisors (2107013340).

169959132121 is an frugal number, since it uses more digits than its factorization.

169959132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100 (or 5050 counting only the distinct ones).

The product of its digits is 262440, while the sum is 49.

Multiplying 169959132121 by its sum of digits (49), we get a square (8327997473929 = 2885827²).

The spelling of 169959132121 in words is "one hundred sixty-nine billion, nine hundred fifty-nine million, one hundred thirty-two thousand, one hundred twenty-one".