243261431 has 8 divisors (see below), whose sum is σ = 283687200. Its totient is φ = 208509504.

The previous prime is 243261413. The next prime is 243261439. The reversal of 243261431 is 134162342.

It is not a de Polignac number, because 243261431 - 2¹⁴ = 243245047 is a prime.

It is a super-2 number, since 2×243261431² = 118352247624335522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243261431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243261439) 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, 354266 + ... + 354951.

It is an arithmetic number, because the mean of its divisors is an integer number (35460900).

Almost surely, 2^243261431 is an apocalyptic number.

243261431 is a deficient number, since it is larger than the sum of its proper divisors (40425769).

243261431 is an frugal number, since it uses more digits than its factorization.

243261431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709238 (or 709224 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 243261431 is about 15596.8404172127. The cubic root of 243261431 is about 624.2488520578.

The spelling of 243261431 in words is "two hundred forty-three million, two hundred sixty-one thousand, four hundred thirty-one".