243142431 has 16 divisors (see below), whose sum is σ = 374325504. Its totient is φ = 137505024.

The previous prime is 243142399. The next prime is 243142433. The reversal of 243142431 is 134241342.

It is not a de Polignac number, because 243142431 - 2⁵ = 243142399 is a prime.

It is a super-2 number, since 2×243142431² = 118236483505179522, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243142433) 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, 57645 + ... + 61718.

It is an arithmetic number, because the mean of its divisors is an integer number (23395344).

Almost surely, 2^243142431 is an apocalyptic number.

243142431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243142431 is a deficient number, since it is larger than the sum of its proper divisors (131183073).

243142431 is a wasteful number, since it uses less digits than its factorization.

243142431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119470.

The product of its digits is 2304, while the sum is 24.

The square root of 243142431 is about 15593.0250753342. The cubic root of 243142431 is about 624.1470442626.

Adding to 243142431 its reverse (134241342), we get a palindrome (377383773).

The spelling of 243142431 in words is "two hundred forty-three million, one hundred forty-two thousand, four hundred thirty-one".