16233561 has 16 divisors (see below), whose sum is σ = 25096320. Its totient is φ = 10351440.

The previous prime is 16233559. The next prime is 16233577. The reversal of 16233561 is 16533261.

16233561 is a `hidden beast` number, since 1 + 623 + 35 + 6 + 1 = 666.

It is not a de Polignac number, because 16233561 - 2¹ = 16233559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16233551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12450 + ... + 13691.

It is an arithmetic number, because the mean of its divisors is an integer number (1568520).

Almost surely, 2^16233561 is an apocalyptic number.

It is an amenable number.

16233561 is a deficient number, since it is larger than the sum of its proper divisors (8862759).

16233561 is a wasteful number, since it uses less digits than its factorization.

16233561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26173 (or 26167 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 16233561 is about 4029.0893512058. The cubic root of 16233561 is about 253.2044102015.

It can be divided in two parts, 1623 and 3561, that added together give a square (5184 = 72²).

The spelling of 16233561 in words is "sixteen million, two hundred thirty-three thousand, five hundred sixty-one".