16881641 has 4 divisors (see below), whose sum is σ = 19293312. Its totient is φ = 14469972.

The previous prime is 16881587. The next prime is 16881643. The reversal of 16881641 is 14618861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14618861 = 17 ⋅859933.

It is a cyclic number.

It is not a de Polignac number, because 16881641 - 2¹⁸ = 16619497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16881643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205825 + ... + 1205838.

It is an arithmetic number, because the mean of its divisors is an integer number (4823328).

Almost surely, 2^16881641 is an apocalyptic number.

It is an amenable number.

16881641 is a deficient number, since it is larger than the sum of its proper divisors (2411671).

16881641 is an equidigital number, since it uses as much as digits as its factorization.

16881641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411670.

The product of its digits is 9216, while the sum is 35.

The square root of 16881641 is about 4108.7274185567. The cubic root of 16881641 is about 256.5300348486.

The spelling of 16881641 in words is "sixteen million, eight hundred eighty-one thousand, six hundred forty-one".