16736981 has 4 divisors (see below), whose sum is σ = 16745952. Its totient is φ = 16728012.

The previous prime is 16736977. The next prime is 16736989. The reversal of 16736981 is 18963761.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16736981 - 2² = 16736977 is a prime.

It is a super-2 number, since 2×16736981² = 560253065988722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16736989) 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, 515 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (4186488).

Almost surely, 2^16736981 is an apocalyptic number.

It is an amenable number.

16736981 is a deficient number, since it is larger than the sum of its proper divisors (8971).

16736981 is an equidigital number, since it uses as much as digits as its factorization.

16736981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8970.

The product of its digits is 54432, while the sum is 41.

The square root of 16736981 is about 4091.0855527598. The cubic root of 16736981 is about 255.7951903957.

The spelling of 16736981 in words is "sixteen million, seven hundred thirty-six thousand, nine hundred eighty-one".