16181009 has 8 divisors (see below), whose sum is σ = 17543232. Its totient is φ = 14835600.

The previous prime is 16180979. The next prime is 16181023. The reversal of 16181009 is 90018161.

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

It is a de Polignac number, because none of the positive numbers 2^k-16181009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16181069) 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, 2159 + ... + 6084.

It is an arithmetic number, because the mean of its divisors is an integer number (2192904).

Almost surely, 2^16181009 is an apocalyptic number.

It is an amenable number.

16181009 is a deficient number, since it is larger than the sum of its proper divisors (1362223).

16181009 is a wasteful number, since it uses less digits than its factorization.

16181009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 16181009 is about 4022.5624917458. The cubic root of 16181009 is about 252.9308866714.

The spelling of 16181009 in words is "sixteen million, one hundred eighty-one thousand, nine".