16981545 has 16 divisors (see below), whose sum is σ = 31052160. Its totient is φ = 7762944.

The previous prime is 16981543. The next prime is 16981553. The reversal of 16981545 is 54518961.

It is not a de Polignac number, because 16981545 - 2¹ = 16981543 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16981541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80760 + ... + 80969.

It is an arithmetic number, because the mean of its divisors is an integer number (1940760).

Almost surely, 2^16981545 is an apocalyptic number.

16981545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16981545 is a deficient number, since it is larger than the sum of its proper divisors (14070615).

16981545 is a wasteful number, since it uses less digits than its factorization.

16981545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161744.

The product of its digits is 43200, while the sum is 39.

The square root of 16981545 is about 4120.8670204218. The cubic root of 16981545 is about 257.0350802745.

The spelling of 16981545 in words is "sixteen million, nine hundred eighty-one thousand, five hundred forty-five".