243437391913 has 8 divisors (see below), whose sum is σ = 254888601408. Its totient is φ = 232058430384.

The previous prime is 243437391893. The next prime is 243437391943. The reversal of 243437391913 is 319193734342.

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-243437391913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243437391943) 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, 18055095 + ... + 18068572.

It is an arithmetic number, because the mean of its divisors is an integer number (31861075176).

Almost surely, 2^243437391913 is an apocalyptic number.

243437391913 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

243437391913 is a deficient number, since it is larger than the sum of its proper divisors (11451209495).

243437391913 is a wasteful number, since it uses less digits than its factorization.

243437391913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36123983.

The product of its digits is 1469664, while the sum is 49.

The spelling of 243437391913 in words is "two hundred forty-three billion, four hundred thirty-seven million, three hundred ninety-one thousand, nine hundred thirteen".