23151745 has 4 divisors (see below), whose sum is σ = 27782100. Its totient is φ = 18521392.

The previous prime is 23151743. The next prime is 23151763. The reversal of 23151745 is 54715132.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3932289 + 19219456 = 1983^2 + 4384^2 .

It is a cyclic number.

It is not a de Polignac number, because 23151745 - 2¹ = 23151743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23151743) 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, 2315170 + ... + 2315179.

It is an arithmetic number, because the mean of its divisors is an integer number (6945525).

Almost surely, 2^23151745 is an apocalyptic number.

It is an amenable number.

23151745 is a deficient number, since it is larger than the sum of its proper divisors (4630355).

23151745 is an equidigital number, since it uses as much as digits as its factorization.

23151745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630354.

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

The square root of 23151745 is about 4811.6260245368. The cubic root of 23151745 is about 285.0107516207.

Adding to 23151745 its reverse (54715132), we get a palindrome (77866877).

The spelling of 23151745 in words is "twenty-three million, one hundred fifty-one thousand, seven hundred forty-five".