23161645 has 8 divisors (see below), whose sum is σ = 29932056. Its totient is φ = 17103936.

The previous prime is 23161643. The next prime is 23161651. The reversal of 23161645 is 54616132.

It can be written as a sum of positive squares in 4 ways, for example, as 64009 + 23097636 = 253^2 + 4806^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23161645 - 2¹ = 23161643 is a prime.

It is a super-3 number, since 3×23161645³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23161643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178102 + ... + 178231.

It is an arithmetic number, because the mean of its divisors is an integer number (3741507).

Almost surely, 2^23161645 is an apocalyptic number.

It is an amenable number.

23161645 is a deficient number, since it is larger than the sum of its proper divisors (6770411).

23161645 is a wasteful number, since it uses less digits than its factorization.

23161645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356351.

The product of its digits is 4320, while the sum is 28.

The square root of 23161645 is about 4812.6546728391. The cubic root of 23161645 is about 285.0513706518.

Adding to 23161645 its reverse (54616132), we get a palindrome (77777777).

The spelling of 23161645 in words is "twenty-three million, one hundred sixty-one thousand, six hundred forty-five".