23231645 has 4 divisors (see below), whose sum is σ = 27877980. Its totient is φ = 18585312.

The previous prime is 23231641. The next prime is 23231669. The reversal of 23231645 is 54613232.

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 18164644 + 5067001 = 4262^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 23231645 - 2² = 23231641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23231641) 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, 2323160 + ... + 2323169.

It is an arithmetic number, because the mean of its divisors is an integer number (6969495).

Almost surely, 2^23231645 is an apocalyptic number.

It is an amenable number.

23231645 is a deficient number, since it is larger than the sum of its proper divisors (4646335).

23231645 is an equidigital number, since it uses as much as digits as its factorization.

23231645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646334.

The product of its digits is 4320, while the sum is 26.

The square root of 23231645 is about 4819.9216798616. The cubic root of 23231645 is about 285.3382461900.

Adding to 23231645 its reverse (54613232), we get a palindrome (77844877).

The spelling of 23231645 in words is "twenty-three million, two hundred thirty-one thousand, six hundred forty-five".