16653971 has 4 divisors (see below), whose sum is σ = 16687200. Its totient is φ = 16620744.

The previous prime is 16653961. The next prime is 16653977. The reversal of 16653971 is 17935661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17935661 = 107 ⋅167623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16653971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16653977) 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, 15851 + ... + 16868.

It is an arithmetic number, because the mean of its divisors is an integer number (4171800).

Almost surely, 2^16653971 is an apocalyptic number.

16653971 is a deficient number, since it is larger than the sum of its proper divisors (33229).

16653971 is an equidigital number, since it uses as much as digits as its factorization.

16653971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33228.

The product of its digits is 34020, while the sum is 38.

The square root of 16653971 is about 4080.9277131554. The cubic root of 16653971 is about 255.3716022616.

The spelling of 16653971 in words is "sixteen million, six hundred fifty-three thousand, nine hundred seventy-one".