231145642 has 32 divisors (see below), whose sum is σ = 435456000. Its totient is φ = 91438704.

The previous prime is 231145609. The next prime is 231145643. The reversal of 231145642 is 246541132.

It is a self number, because there is not a number n which added to its sum of digits gives 231145642.

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 15 ways as a sum of consecutive naturals, for example, 4042 + ... + 21877.

It is an arithmetic number, because the mean of its divisors is an integer number (13608000).

Almost surely, 2^231145642 is an apocalyptic number.

231145642 is a deficient number, since it is larger than the sum of its proper divisors (204310358).

231145642 is a wasteful number, since it uses less digits than its factorization.

231145642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25955 (or 25941 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 231145642 is about 15203.4746686407. The cubic root of 231145642 is about 613.7081676807.

Adding to 231145642 its reverse (246541132), we get a palindrome (477686774).

The spelling of 231145642 in words is "two hundred thirty-one million, one hundred forty-five thousand, six hundred forty-two".