231020042 has 16 divisors (see below), whose sum is σ = 382590432. Its totient is φ = 103743120.

The previous prime is 231019991. The next prime is 231020047. The reversal of 231020042 is 240020132.

It is a junction number, because it is equal to n+sod(n) for n = 231019999 and 231020026.

It is not an unprimeable number, because it can be changed into a prime (231020047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61433 + ... + 65084.

It is an arithmetic number, because the mean of its divisors is an integer number (23911902).

Almost surely, 2^231020042 is an apocalyptic number.

231020042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231020042 is a deficient number, since it is larger than the sum of its proper divisors (151570390).

231020042 is a wasteful number, since it uses less digits than its factorization.

231020042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126613.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 231020042 is about 15199.3434726635. The cubic root of 231020042 is about 613.5969885543.

Adding to 231020042 its reverse (240020132), we get a palindrome (471040174).

The spelling of 231020042 in words is "two hundred thirty-one million, twenty thousand, forty-two".