243023331 has 4 divisors (see below), whose sum is σ = 324031112. Its totient is φ = 162015552.

The previous prime is 243023303. The next prime is 243023371. The reversal of 243023331 is 133320342.

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

It is not a de Polignac number, because 243023331 - 2¹¹ = 243021283 is a prime.

It is a super-2 number, since 2×243023331² = 118120678820671122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243023298 and 243023307.

It is not an unprimeable number, because it can be changed into a prime (243023371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40503886 + ... + 40503891.

It is an arithmetic number, because the mean of its divisors is an integer number (81007778).

Almost surely, 2^243023331 is an apocalyptic number.

243023331 is a deficient number, since it is larger than the sum of its proper divisors (81007781).

243023331 is an equidigital number, since it uses as much as digits as its factorization.

243023331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81007780.

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 243023331 is about 15589.2055923322. The cubic root of 243023331 is about 624.0451176491.

Adding to 243023331 its reverse (133320342), we get a palindrome (376343673).

The spelling of 243023331 in words is "two hundred forty-three million, twenty-three thousand, three hundred thirty-one".