16540881 has 24 divisors (see below), whose sum is σ = 27168480. Its totient is φ = 8894592.

The previous prime is 16540877. The next prime is 16540883. The reversal of 16540881 is 18804561.

It is not a de Polignac number, because 16540881 - 2² = 16540877 is a prime.

It is a super-2 number, since 2×16540881² = 547201488512322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16540883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 811 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (1132020).

Almost surely, 2^16540881 is an apocalyptic number.

It is an amenable number.

16540881 is a deficient number, since it is larger than the sum of its proper divisors (10627599).

16540881 is a wasteful number, since it uses less digits than its factorization.

16540881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6653 (or 6646 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 16540881 is about 4067.0481924856. The cubic root of 16540881 is about 254.7922490900.

The spelling of 16540881 in words is "sixteen million, five hundred forty thousand, eight hundred eighty-one".