23155145 has 16 divisors (see below), whose sum is σ = 30127440. Its totient is φ = 16982784.

The previous prime is 23155127. The next prime is 23155147. The reversal of 23155145 is 54155132.

It can be written as a sum of positive squares in 8 ways, for example, as 8737936 + 14417209 = 2956^2 + 3797^2 .

It is not a de Polignac number, because 23155145 - 2⁸ = 23154889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23155147) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9071 + ... + 11339.

It is an arithmetic number, because the mean of its divisors is an integer number (1882965).

Almost surely, 2^23155145 is an apocalyptic number.

It is an amenable number.

23155145 is a deficient number, since it is larger than the sum of its proper divisors (6972295).

23155145 is a wasteful number, since it uses less digits than its factorization.

23155145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444.

The product of its digits is 3000, while the sum is 26.

The square root of 23155145 is about 4811.9793224826. The cubic root of 23155145 is about 285.0247028962.

The spelling of 23155145 in words is "twenty-three million, one hundred fifty-five thousand, one hundred forty-five".