231637442 has 16 divisors (see below), whose sum is σ = 361317240. Its totient is φ = 111240192.

The previous prime is 231637403. The next prime is 231637447. The reversal of 231637442 is 244736132.

It can be written as a sum of positive squares in 4 ways, for example, as 213481321 + 18156121 = 14611^2 + 4261^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231637399 and 231637408.

It is not an unprimeable number, because it can be changed into a prime (231637447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848 + ... + 21540.

Almost surely, 2^231637442 is an apocalyptic number.

231637442 is a deficient number, since it is larger than the sum of its proper divisors (129679798).

231637442 is a wasteful number, since it uses less digits than its factorization.

231637442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20917.

The product of its digits is 24192, while the sum is 32.

The square root of 231637442 is about 15219.6400088833. The cubic root of 231637442 is about 614.1431140471.

The spelling of 231637442 in words is "two hundred thirty-one million, six hundred thirty-seven thousand, four hundred forty-two".