16600981 has 4 divisors (see below), whose sum is σ = 16811200. Its totient is φ = 16390764.

The previous prime is 16600951. The next prime is 16601029. The reversal of 16600981 is 18900661.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 18900661 = 13 ⋅1453897.

It is a cyclic number.

It is not a de Polignac number, because 16600981 - 2⁵ = 16600949 is a prime.

It is a super-2 number, since 2×16600981² = 551185140324722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16600931) 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, 104991 + ... + 105148.

It is an arithmetic number, because the mean of its divisors is an integer number (4202800).

Almost surely, 2^16600981 is an apocalyptic number.

It is an amenable number.

16600981 is a deficient number, since it is larger than the sum of its proper divisors (210219).

16600981 is an equidigital number, since it uses as much as digits as its factorization.

16600981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210218.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 16600981 is about 4074.4301442042. The cubic root of 16600981 is about 255.1004653473.

The spelling of 16600981 in words is "sixteen million, six hundred thousand, nine hundred eighty-one".