243155055531 has 8 divisors (see below), whose sum is σ = 326353805824. Its totient is φ = 161029837800.

The previous prime is 243155055529. The next prime is 243155055553. The reversal of 243155055531 is 135550551342.

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

It is not a de Polignac number, because 243155055531 - 2¹ = 243155055529 is a prime.

It is a super-2 number, since 2×243155055531² (a number of 24 digits) 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 243155055531.

It is not an unprimeable number, because it can be changed into a prime (243155055131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268382611 + ... + 268383516.

It is an arithmetic number, because the mean of its divisors is an integer number (40794225728).

Almost surely, 2^243155055531 is an apocalyptic number.

243155055531 is a deficient number, since it is larger than the sum of its proper divisors (83198750293).

243155055531 is a wasteful number, since it uses less digits than its factorization.

243155055531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536766281.

The product of its (nonzero) digits is 225000, while the sum is 39.

The spelling of 243155055531 in words is "two hundred forty-three billion, one hundred fifty-five million, fifty-five thousand, five hundred thirty-one".