231585442 has 32 divisors (see below), whose sum is σ = 390930624. Its totient is φ = 101966400.

The previous prime is 231585437. The next prime is 231585449. The reversal of 231585442 is 244585132.

It is a junction number, because it is equal to n+sod(n) for n = 231585398 and 231585407.

It is not an unprimeable number, because it can be changed into a prime (231585449) 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, 238017 + ... + 238987.

It is an arithmetic number, because the mean of its divisors is an integer number (12216582).

Almost surely, 2^231585442 is an apocalyptic number.

231585442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231585442 is a deficient number, since it is larger than the sum of its proper divisors (159345182).

231585442 is a wasteful number, since it uses less digits than its factorization.

231585442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314.

The product of its digits is 38400, while the sum is 34.

The square root of 231585442 is about 15217.9315940111. The cubic root of 231585442 is about 614.0971545343.

The spelling of 231585442 in words is "two hundred thirty-one million, five hundred eighty-five thousand, four hundred forty-two".