243131132391 has 16 divisors (see below), whose sum is σ = 389984774400. Its totient is φ = 131619860928.

The previous prime is 243131132381. The next prime is 243131132441. The reversal of 243131132391 is 193231131342.

It is not a de Polignac number, because 243131132391 - 2⁶ = 243131132327 is a prime.

It is a super-2 number, since 2×243131132391² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243131132381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304675206 + ... + 304676003.

It is an arithmetic number, because the mean of its divisors is an integer number (24374048400).

Almost surely, 2^243131132391 is an apocalyptic number.

243131132391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243131132391 is a deficient number, since it is larger than the sum of its proper divisors (146853642009).

243131132391 is a wasteful number, since it uses less digits than its factorization.

243131132391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609351238.

The product of its digits is 11664, while the sum is 33.

The spelling of 243131132391 in words is "two hundred forty-three billion, one hundred thirty-one million, one hundred thirty-two thousand, three hundred ninety-one".