231522142 has 4 divisors (see below), whose sum is σ = 347283216. Its totient is φ = 115761070.

The previous prime is 231522139. The next prime is 231522169. The reversal of 231522142 is 241225132.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57880534 + ... + 57880537.

It is an arithmetic number, because the mean of its divisors is an integer number (86820804).

Almost surely, 2^231522142 is an apocalyptic number.

231522142 is a deficient number, since it is larger than the sum of its proper divisors (115761074).

231522142 is a wasteful number, since it uses less digits than its factorization.

231522142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115761073.

The product of its digits is 960, while the sum is 22.

The square root of 231522142 is about 15215.8516685725. The cubic root of 231522142 is about 614.0411983801.

Adding to 231522142 its reverse (241225132), we get a palindrome (472747274).

The spelling of 231522142 in words is "two hundred thirty-one million, five hundred twenty-two thousand, one hundred forty-two".