243112551 has 16 divisors (see below), whose sum is σ = 356323968. Its totient is φ = 146213600.

The previous prime is 243112531. The next prime is 243112559. The reversal of 243112551 is 155211342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243112551 - 2⁹ = 243112039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243112559) 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, 23796 + ... + 32441.

It is an arithmetic number, because the mean of its divisors is an integer number (22270248).

Almost surely, 2^243112551 is an apocalyptic number.

243112551 is a deficient number, since it is larger than the sum of its proper divisors (113211417).

243112551 is a wasteful number, since it uses less digits than its factorization.

243112551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56382.

The product of its digits is 1200, while the sum is 24.

The square root of 243112551 is about 15592.0669252027. The cubic root of 243112551 is about 624.1214758779.

Adding to 243112551 its reverse (155211342), we get a palindrome (398323893).

It can be divided in two parts, 24311 and 2551, that added together give a palindrome (26862).

The spelling of 243112551 in words is "two hundred forty-three million, one hundred twelve thousand, five hundred fifty-one".