16991042 has 16 divisors (see below), whose sum is σ = 26733240. Its totient is φ = 8088192.

The previous prime is 16991033. The next prime is 16991057. The reversal of 16991042 is 24019961.

It can be written as a sum of positive squares in 4 ways, for example, as 16556761 + 434281 = 4069^2 + 659^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2228 + ... + 6240.

Almost surely, 2^16991042 is an apocalyptic number.

16991042 is a deficient number, since it is larger than the sum of its proper divisors (9742198).

16991042 is a wasteful number, since it uses less digits than its factorization.

16991042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 16991042 is about 4122.0191654091. The cubic root of 16991042 is about 257.0829873257.

The spelling of 16991042 in words is "sixteen million, nine hundred ninety-one thousand, forty-two".