231531442 has 4 divisors (see below), whose sum is σ = 347297166. Its totient is φ = 115765720.

The previous prime is 231531437. The next prime is 231531451. The reversal of 231531442 is 244135132.

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

It can be written as a sum of positive squares in only one way, i.e., 231070401 + 461041 = 15201^2 + 679^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57882859 + ... + 57882862.

Almost surely, 2^231531442 is an apocalyptic number.

231531442 is a deficient number, since it is larger than the sum of its proper divisors (115765724).

231531442 is a wasteful number, since it uses less digits than its factorization.

231531442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115765723.

The product of its digits is 2880, while the sum is 25.

The square root of 231531442 is about 15216.1572678518. The cubic root of 231531442 is about 614.0494200655.

Adding to 231531442 its reverse (244135132), we get a palindrome (475666574).

The spelling of 231531442 in words is "two hundred thirty-one million, five hundred thirty-one thousand, four hundred forty-two".