23142155 has 4 divisors (see below), whose sum is σ = 27770592. Its totient is φ = 18513720.

The previous prime is 23142107. The next prime is 23142157. The reversal of 23142155 is 55124132.

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

It is not a de Polignac number, because 23142155 - 2¹⁶ = 23076619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23142155.

It is not an unprimeable number, because it can be changed into a prime (23142157) 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, 2314211 + ... + 2314220.

It is an arithmetic number, because the mean of its divisors is an integer number (6942648).

Almost surely, 2^23142155 is an apocalyptic number.

23142155 is a deficient number, since it is larger than the sum of its proper divisors (4628437).

23142155 is an equidigital number, since it uses as much as digits as its factorization.

23142155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4628436.

The product of its digits is 1200, while the sum is 23.

The square root of 23142155 is about 4810.6293767032. The cubic root of 23142155 is about 284.9713934558.

Adding to 23142155 its reverse (55124132), we get a palindrome (78266287).

The spelling of 23142155 in words is "twenty-three million, one hundred forty-two thousand, one hundred fifty-five".