243151331 has 12 divisors (see below), whose sum is σ = 258181392. Its totient is φ = 228562224.

The previous prime is 243151319. The next prime is 243151409. The reversal of 243151331 is 133151342.

It is not a de Polignac number, because 243151331 - 2¹⁰ = 243150307 is a prime.

It is a super-2 number, since 2×243151331² = 118245139534143122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 243151297 and 243151306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243151231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78545 + ... + 81581.

It is an arithmetic number, because the mean of its divisors is an integer number (21515116).

Almost surely, 2^243151331 is an apocalyptic number.

243151331 is a deficient number, since it is larger than the sum of its proper divisors (15030061).

243151331 is an equidigital number, since it uses as much as digits as its factorization.

243151331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178 (or 3119 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 243151331 is about 15593.3104567311. The cubic root of 243151331 is about 624.1546596082.

The spelling of 243151331 in words is "two hundred forty-three million, one hundred fifty-one thousand, three hundred thirty-one".