16991041 has 8 divisors (see below), whose sum is σ = 18065160. Its totient is φ = 15925248.

The previous prime is 16991033. The next prime is 16991057. The reversal of 16991041 is 14019961.

It can be written as a sum of positive squares in 4 ways, for example, as 11833600 + 5157441 = 3440^2 + 2271^2 .

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

It is a 5-Lehmer number, since φ(16991041) divides (16991041-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 16991041 - 2³ = 16991033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16990994 and 16991012.

It is not an unprimeable number, because it can be changed into a prime (16991021) 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, 2425 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (2258145).

Almost surely, 2^16991041 is an apocalyptic number.

It is an amenable number.

16991041 is a deficient number, since it is larger than the sum of its proper divisors (1074119).

16991041 is a wasteful number, since it uses less digits than its factorization.

16991041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4163.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 16991041 is about 4122.0190441093. The cubic root of 16991041 is about 257.0829822822.

The spelling of 16991041 in words is "sixteen million, nine hundred ninety-one thousand, forty-one".