243105551231 has 6 divisors (see below), whose sum is σ = 258247073760. Its totient is φ = 228805224416.

The previous prime is 243105551219. The next prime is 243105551233. The reversal of 243105551231 is 132155501342.

It is a de Polignac number, because none of the positive numbers 2^k-243105551231 is a prime.

It is a super-2 number, since 2×243105551231² (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 (243105551233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420597551 + ... + 420598128.

It is an arithmetic number, because the mean of its divisors is an integer number (43041178960).

Almost surely, 2^243105551231 is an apocalyptic number.

243105551231 is a deficient number, since it is larger than the sum of its proper divisors (15141522529).

243105551231 is an equidigital number, since it uses as much as digits as its factorization.

243105551231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841195713 (or 841195696 counting only the distinct ones).

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

The spelling of 243105551231 in words is "two hundred forty-three billion, one hundred five million, five hundred fifty-one thousand, two hundred thirty-one".