231445645 has 4 divisors (see below), whose sum is σ = 277734780. Its totient is φ = 185156512.

The previous prime is 231445639. The next prime is 231445649. The reversal of 231445645 is 546544132.

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 38180041 + 193265604 = 6179^2 + 13902^2 .

It is a cyclic number.

It is not a de Polignac number, because 231445645 - 2³ = 231445637 is a prime.

It is a super-3 number, since 3×231445645³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231445645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231445649) 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, 23144560 + ... + 23144569.

It is an arithmetic number, because the mean of its divisors is an integer number (69433695).

Almost surely, 2^231445645 is an apocalyptic number.

It is an amenable number.

231445645 is a deficient number, since it is larger than the sum of its proper divisors (46289135).

231445645 is an equidigital number, since it uses as much as digits as its factorization.

231445645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46289134.

The product of its digits is 57600, while the sum is 34.

The square root of 231445645 is about 15213.3377337125. The cubic root of 231445645 is about 613.9735626838.

Adding to 231445645 its reverse (546544132), we get a palindrome (777989777).

The spelling of 231445645 in words is "two hundred thirty-one million, four hundred forty-five thousand, six hundred forty-five".