16224661 has 4 divisors (see below), whose sum is σ = 16271500. Its totient is φ = 16177824.

The previous prime is 16224641. The next prime is 16224671. The reversal of 16224661 is 16642261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16642261 = 419 ⋅39719.

It can be written as a sum of positive squares in 2 ways, for example, as 9302500 + 6922161 = 3050^2 + 2631^2 .

It is a cyclic number.

It is not a de Polignac number, because 16224661 - 2⁵ = 16224629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16224641) 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, 22896 + ... + 23593.

It is an arithmetic number, because the mean of its divisors is an integer number (4067875).

Almost surely, 2^16224661 is an apocalyptic number.

It is an amenable number.

16224661 is a deficient number, since it is larger than the sum of its proper divisors (46839).

16224661 is an equidigital number, since it uses as much as digits as its factorization.

16224661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46838.

The product of its digits is 3456, while the sum is 28.

The square root of 16224661 is about 4027.9847318479. The cubic root of 16224661 is about 253.1581288956.

The spelling of 16224661 in words is "sixteen million, two hundred twenty-four thousand, six hundred sixty-one".