16991129 has 8 divisors (see below), whose sum is σ = 17754120. Its totient is φ = 16240000.

The previous prime is 16991119. The next prime is 16991137. The reversal of 16991129 is 92119961.

It can be written as a sum of positive squares in 4 ways, for example, as 12411529 + 4579600 = 3523^2 + 2140^2 .

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

It is not a de Polignac number, because 16991129 - 2⁸ = 16990873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16991092 and 16991101.

It is not an unprimeable number, because it can be changed into a prime (16991119) 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, 29 + ... + 5829.

It is an arithmetic number, because the mean of its divisors is an integer number (2219265).

Almost surely, 2^16991129 is an apocalyptic number.

It is an amenable number.

16991129 is a deficient number, since it is larger than the sum of its proper divisors (762991).

16991129 is a wasteful number, since it uses less digits than its factorization.

16991129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931.

The product of its digits is 8748, while the sum is 38.

The square root of 16991129 is about 4122.0297184761. The cubic root of 16991129 is about 257.0834261095.

The spelling of 16991129 in words is "sixteen million, nine hundred ninety-one thousand, one hundred twenty-nine".