16881001 has 2 divisors, whose sum is σ = 16881002. Its totient is φ = 16881000.

The previous prime is 16880993. The next prime is 16881013. The reversal of 16881001 is 10018861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 2893401 = 3740^2 + 1701^2 .

It is an emirp because it is prime and its reverse (10018861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16881001 - 2³ = 16880993 is a prime.

It is not a weakly prime, because it can be changed into another prime (16881061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8440500 + 8440501.

It is an arithmetic number, because the mean of its divisors is an integer number (8440501).

Almost surely, 2^16881001 is an apocalyptic number.

It is an amenable number.

16881001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16881001 is an equidigital number, since it uses as much as digits as its factorization.

16881001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 16881001 is about 4108.6495348228. The cubic root of 16881001 is about 256.5267930371.

Adding to 16881001 its reverse (10018861), we get a palindrome (26899862).

The spelling of 16881001 in words is "sixteen million, eight hundred eighty-one thousand, one".