169991136 has 192 divisors, whose sum is σ = 575285760. Its totient is φ = 48428928.

The previous prime is 169991123. The next prime is 169991147. The reversal of 169991136 is 631199961.

It is a super-3 number, since 3×169991136³ (a number of 26 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 169991091 and 169991100.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 489715 + ... + 490061.

It is an arithmetic number, because the mean of its divisors is an integer number (2996280).

Almost surely, 2^169991136 is an apocalyptic number.

169991136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169991136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287642880).

169991136 is an abundant number, since it is smaller than the sum of its proper divisors (405294624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169991136 is an frugal number, since it uses more digits than its factorization.

169991136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 359 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 169991136 is about 13038.0648870912. The cubic root of 169991136 is about 553.9561973648.

The spelling of 169991136 in words is "one hundred sixty-nine million, nine hundred ninety-one thousand, one hundred thirty-six".