243427531 has 8 divisors (see below), whose sum is σ = 251955200. Its totient is φ = 234942120.

The previous prime is 243427529. The next prime is 243427543. The reversal of 243427531 is 135724342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243427531 - 2¹ = 243427529 is a prime.

It is a super-2 number, since 2×243427531² = 118513925697511922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243427493 and 243427502.

It is not an unprimeable number, because it can be changed into a prime (243427501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390 + ... + 22108.

It is an arithmetic number, because the mean of its divisors is an integer number (31494400).

Almost surely, 2^243427531 is an apocalyptic number.

243427531 is the 6978-th centered decagonal number.

243427531 is a deficient number, since it is larger than the sum of its proper divisors (8527669).

243427531 is a wasteful number, since it uses less digits than its factorization.

243427531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21129.

The product of its digits is 20160, while the sum is 31.

The square root of 243427531 is about 15602.1643049931. The cubic root of 243427531 is about 624.3908997078.

The spelling of 243427531 in words is "two hundred forty-three million, four hundred twenty-seven thousand, five hundred thirty-one".