16611923 has 4 divisors (see below), whose sum is σ = 16695600. Its totient is φ = 16528248.

The previous prime is 16611919. The next prime is 16611937. The reversal of 16611923 is 32911661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32911661 = 331 ⋅99431.

It is a cyclic number.

It is not a de Polignac number, because 16611923 - 2² = 16611919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16611523) 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, 41540 + ... + 41937.

It is an arithmetic number, because the mean of its divisors is an integer number (4173900).

Almost surely, 2^16611923 is an apocalyptic number.

16611923 is a deficient number, since it is larger than the sum of its proper divisors (83677).

16611923 is an equidigital number, since it uses as much as digits as its factorization.

16611923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83676.

The product of its digits is 1944, while the sum is 29.

The square root of 16611923 is about 4075.7726874790. The cubic root of 16611923 is about 255.1565001131.

It can be divided in two parts, 16611 and 923, that multiplied together give a triangular number (15331953 = T₅₅₃₇).

The spelling of 16611923 in words is "sixteen million, six hundred eleven thousand, nine hundred twenty-three".