231243434 has 4 divisors (see below), whose sum is σ = 346865154. Its totient is φ = 115621716.

The previous prime is 231243421. The next prime is 231243437. The reversal of 231243434 is 434342132.

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., 231131209 + 112225 = 15203^2 + 335^2 .

It is a super-2 number, since 2×231243434² = 106947051536224712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231243437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57810857 + ... + 57810860.

Almost surely, 2^231243434 is an apocalyptic number.

231243434 is a deficient number, since it is larger than the sum of its proper divisors (115621720).

231243434 is a wasteful number, since it uses less digits than its factorization.

231243434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115621719.

The product of its digits is 6912, while the sum is 26.

The square root of 231243434 is about 15206.6904354629. The cubic root of 231243434 is about 613.7947037234.

Adding to 231243434 its reverse (434342132), we get a palindrome (665585566).

The spelling of 231243434 in words is "two hundred thirty-one million, two hundred forty-three thousand, four hundred thirty-four".