243155213051 has 4 divisors (see below), whose sum is σ = 251539875600. Its totient is φ = 234770550504.

The previous prime is 243155213033. The next prime is 243155213087. The reversal of 243155213051 is 150312551342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150312551342 = 2 ⋅75156275671.

It is a cyclic number.

It is not a de Polignac number, because 243155213051 - 2⁶ = 243155212987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243155212999 and 243155213017.

It is not an unprimeable number, because it can be changed into a prime (243155813051) 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, 4192331231 + ... + 4192331288.

It is an arithmetic number, because the mean of its divisors is an integer number (62884968900).

Almost surely, 2^243155213051 is an apocalyptic number.

243155213051 is a deficient number, since it is larger than the sum of its proper divisors (8384662549).

243155213051 is an equidigital number, since it uses as much as digits as its factorization.

243155213051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8384662548.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 243155213051 its reverse (150312551342), we get a palindrome (393467764393).

The spelling of 243155213051 in words is "two hundred forty-three billion, one hundred fifty-five million, two hundred thirteen thousand, fifty-one".