231145641 has 24 divisors (see below), whose sum is σ = 345436416. Its totient is φ = 148785120.

The previous prime is 231145609. The next prime is 231145643. The reversal of 231145641 is 146541132.

It is a happy number.

231145641 is a `hidden beast` number, since 2 + 3 + 1 + 14 + 5 + 641 = 666.

It is not a de Polignac number, because 231145641 - 2⁵ = 231145609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231145643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189951 + ... + 191163.

It is an arithmetic number, because the mean of its divisors is an integer number (14393184).

Almost surely, 2^231145641 is an apocalyptic number.

It is an amenable number.

231145641 is a deficient number, since it is larger than the sum of its proper divisors (114290775).

231145641 is a wasteful number, since it uses less digits than its factorization.

231145641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933 (or 1930 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 231145641 is about 15203.4746357535. The cubic root of 231145641 is about 613.7081667957.

Adding to 231145641 its reverse (146541132), we get a palindrome (377686773).

The spelling of 231145641 in words is "two hundred thirty-one million, one hundred forty-five thousand, six hundred forty-one".