243117731325731 has 8 divisors (see below), whose sum is σ = 253689539016960. Its totient is φ = 232546046263432.

The previous prime is 243117731325691. The next prime is 243117731325773. The reversal of 243117731325731 is 137523137711342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243117731325731 is a prime.

It is a super-2 number, since 2×243117731325731² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243117731325731.

It is not an unprimeable number, because it can be changed into a prime (243117731325631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26594471 + ... + 34547088.

It is an arithmetic number, because the mean of its divisors is an integer number (31711192377120).

Almost surely, 2^{243117731325731} is an apocalyptic number.

243117731325731 is a deficient number, since it is larger than the sum of its proper divisors (10571807691229).

243117731325731 is a wasteful number, since it uses less digits than its factorization.

243117731325731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61314465.

The product of its digits is 2222640, while the sum is 50.

The spelling of 243117731325731 in words is "two hundred forty-three trillion, one hundred seventeen billion, seven hundred thirty-one million, three hundred twenty-five thousand, seven hundred thirty-one".