243132551 has 8 divisors (see below), whose sum is σ = 248586240. Its totient is φ = 237690648.

The previous prime is 243132541. The next prime is 243132577. The reversal of 243132551 is 155231342.

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 243132551 - 2¹⁰ = 243131527 is a prime.

It is a super-2 number, since 2×243132551² = 118226874711535202, 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 243132551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243132511) 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 7 ways as a sum of consecutive naturals, for example, 48710 + ... + 53468.

It is an arithmetic number, because the mean of its divisors is an integer number (31073280).

Almost surely, 2^243132551 is an apocalyptic number.

243132551 is a deficient number, since it is larger than the sum of its proper divisors (5453689).

243132551 is a wasteful number, since it uses less digits than its factorization.

243132551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5893.

The product of its digits is 3600, while the sum is 26.

The square root of 243132551 is about 15592.7082638007. The cubic root of 243132551 is about 624.1385901557.

Adding to 243132551 its reverse (155231342), we get a palindrome (398363893).

The spelling of 243132551 in words is "two hundred forty-three million, one hundred thirty-two thousand, five hundred fifty-one".