243155054431 has 4 divisors (see below), whose sum is σ = 247276326600. Its totient is φ = 239033782264.

The previous prime is 243155054419. The next prime is 243155054477. The reversal of 243155054431 is 134450551342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134450551342 = 2 ⋅67225275671.

It is a cyclic number.

It is not a de Polignac number, because 243155054431 - 2¹⁷ = 243154923359 is a prime.

It is a super-2 number, since 2×243155054431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155054411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060635996 + ... + 2060636113.

It is an arithmetic number, because the mean of its divisors is an integer number (61819081650).

Almost surely, 2^243155054431 is an apocalyptic number.

243155054431 is a deficient number, since it is larger than the sum of its proper divisors (4121272169).

243155054431 is an equidigital number, since it uses as much as digits as its factorization.

243155054431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121272168.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 243155054431 in words is "two hundred forty-three billion, one hundred fifty-five million, fifty-four thousand, four hundred thirty-one".