169137121 has 4 divisors (see below), whose sum is σ = 169413652. Its totient is φ = 168860592.

The previous prime is 169137109. The next prime is 169137127. The reversal of 169137121 is 121731961.

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 45037521 + 124099600 = 6711^2 + 11140^2 .

It is a cyclic number.

It is not a de Polignac number, because 169137121 - 2²¹ = 167039969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169137127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137346 + ... + 138571.

It is an arithmetic number, because the mean of its divisors is an integer number (42353413).

Almost surely, 2^169137121 is an apocalyptic number.

It is an amenable number.

169137121 is a deficient number, since it is larger than the sum of its proper divisors (276531).

169137121 is an equidigital number, since it uses as much as digits as its factorization.

169137121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276530.

The product of its digits is 2268, while the sum is 31.

The square root of 169137121 is about 13005.2728152853. The cubic root of 169137121 is about 553.0269697679.

The spelling of 169137121 in words is "one hundred sixty-nine million, one hundred thirty-seven thousand, one hundred twenty-one".