243111995 has 16 divisors (see below), whose sum is σ = 334817280. Its totient is φ = 166002144.

The previous prime is 243111989. The next prime is 243111997. The reversal of 243111995 is 599111342.

It is a happy number.

It is not a de Polignac number, because 243111995 - 2¹⁶ = 243046459 is a prime.

It is a super-2 number, since 2×243111995² = 118206884225760050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (243111997) 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 15 ways as a sum of consecutive naturals, for example, 6167 + ... + 22896.

It is an arithmetic number, because the mean of its divisors is an integer number (20926080).

Almost surely, 2^243111995 is an apocalyptic number.

243111995 is a deficient number, since it is larger than the sum of its proper divisors (91705285).

243111995 is a wasteful number, since it uses less digits than its factorization.

243111995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29314.

The product of its digits is 9720, while the sum is 35.

The square root of 243111995 is about 15592.0490956128. The cubic root of 243111995 is about 624.1210000875.

The spelling of 243111995 in words is "two hundred forty-three million, one hundred eleven thousand, nine hundred ninety-five".