23147155 has 4 divisors (see below), whose sum is σ = 27776592. Its totient is φ = 18517720.

The previous prime is 23147143. The next prime is 23147197. The reversal of 23147155 is 55174132.

It is a happy number.

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

It is not a de Polignac number, because 23147155 - 2¹⁵ = 23114387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314711 + ... + 2314720.

It is an arithmetic number, because the mean of its divisors is an integer number (6944148).

Almost surely, 2^23147155 is an apocalyptic number.

23147155 is a deficient number, since it is larger than the sum of its proper divisors (4629437).

23147155 is an equidigital number, since it uses as much as digits as its factorization.

23147155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629436.

The product of its digits is 4200, while the sum is 28.

The square root of 23147155 is about 4811.1490311567. The cubic root of 23147155 is about 284.9919152318.

The spelling of 23147155 in words is "twenty-three million, one hundred forty-seven thousand, one hundred fifty-five".