23161545 has 48 divisors (see below), whose sum is σ = 45444672. Its totient is φ = 11223360.

The previous prime is 23161543. The next prime is 23161547. The reversal of 23161545 is 54516132.

23161545 is a `hidden beast` number, since 2 + 3 + 1 + 615 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (23161543) and next prime (23161547).

It is not a de Polignac number, because 23161545 - 2¹ = 23161543 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23161543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12499 + ... + 14231.

It is an arithmetic number, because the mean of its divisors is an integer number (946764).

Almost surely, 2^23161545 is an apocalyptic number.

It is an amenable number.

23161545 is a deficient number, since it is larger than the sum of its proper divisors (22283127).

23161545 is a wasteful number, since it uses less digits than its factorization.

23161545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764 (or 1752 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 23161545 is about 4812.6442835514. The cubic root of 23161545 is about 285.0509604164.

Adding to 23161545 its reverse (54516132), we get a palindrome (77677677).

It can be divided in two parts, 231 and 61545, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 23161545 in words is "twenty-three million, one hundred sixty-one thousand, five hundred forty-five".