23201155 has 4 divisors (see below), whose sum is σ = 27841392. Its totient is φ = 18560920.

The previous prime is 23201153. The next prime is 23201159. The reversal of 23201155 is 55110232.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 23201155 - 2¹ = 23201153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23201153) 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, 2320111 + ... + 2320120.

It is an arithmetic number, because the mean of its divisors is an integer number (6960348).

Almost surely, 2^23201155 is an apocalyptic number.

23201155 is a deficient number, since it is larger than the sum of its proper divisors (4640237).

23201155 is an equidigital number, since it uses as much as digits as its factorization.

23201155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640236.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 23201155 is about 4816.7577269362. The cubic root of 23201155 is about 285.2133623380.

Adding to 23201155 its reverse (55110232), we get a palindrome (78311387).

The spelling of 23201155 in words is "twenty-three million, two hundred one thousand, one hundred fifty-five".