161827509 has 8 divisors (see below), whose sum is σ = 217062720. Its totient is φ = 107238656.

The previous prime is 161827489. The next prime is 161827513. The reversal of 161827509 is 905728161.

161827509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161827509 - 2¹⁶ = 161761973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161827109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161004 + ... + 162005.

It is an arithmetic number, because the mean of its divisors is an integer number (27132840).

Almost surely, 2^161827509 is an apocalyptic number.

It is an amenable number.

161827509 is a deficient number, since it is larger than the sum of its proper divisors (55235211).

161827509 is a wasteful number, since it uses less digits than its factorization.

161827509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323179.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 161827509 is about 12721.1441702388. The cubic root of 161827509 is about 544.9426295416.

The spelling of 161827509 in words is "one hundred sixty-one million, eight hundred twenty-seven thousand, five hundred nine".