16542981 has 32 divisors (see below), whose sum is σ = 30168320. Its totient is φ = 8724672.

The previous prime is 16542961. The next prime is 16542983. The reversal of 16542981 is 18924561.

It is not a de Polignac number, because 16542981 - 2¹⁴ = 16526597 is a prime.

It is a super-2 number, since 2×16542981² = 547340440732722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16542983) 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 31 ways as a sum of consecutive naturals, for example, 910 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (942760).

Almost surely, 2^16542981 is an apocalyptic number.

It is an amenable number.

16542981 is a deficient number, since it is larger than the sum of its proper divisors (13625339).

16542981 is a wasteful number, since it uses less digits than its factorization.

16542981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762 (or 6756 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 16542981 is about 4067.3063567919. The cubic root of 16542981 is about 254.8030312864.

The spelling of 16542981 in words is "sixteen million, five hundred forty-two thousand, nine hundred eighty-one".