243215054512131 has 16 divisors (see below), whose sum is σ = 349450006822560. Its totient is φ = 149577316915200.

The previous prime is 243215054512069. The next prime is 243215054512141. The reversal of 243215054512131 is 131215450512342.

It is not a de Polignac number, because 243215054512131 - 2²¹ = 243215052414979 is a prime.

It is a super-2 number, since 2×243215054512131² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 243215054512131.

It is not an unprimeable number, because it can be changed into a prime (243215054512141) 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, 1947558876 + ... + 1947683753.

It is an arithmetic number, because the mean of its divisors is an integer number (21840625426410).

Almost surely, 2^{243215054512131} is an apocalyptic number.

243215054512131 is a deficient number, since it is larger than the sum of its proper divisors (106234952310429).

243215054512131 is a wasteful number, since it uses less digits than its factorization.

243215054512131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895244246.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 243215054512131 in words is "two hundred forty-three trillion, two hundred fifteen billion, fifty-four million, five hundred twelve thousand, one hundred thirty-one".