243421189631 has 4 divisors (see below), whose sum is σ = 244766058264. Its totient is φ = 242076321000.

The previous prime is 243421189603. The next prime is 243421189639. The reversal of 243421189631 is 136981124342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136981124342 = 2 ⋅68490562171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243421189631 is a prime.

It is a super-2 number, since 2×243421189631² (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 (243421189639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672434045 + ... + 672434406.

It is an arithmetic number, because the mean of its divisors is an integer number (61191514566).

Almost surely, 2^243421189631 is an apocalyptic number.

243421189631 is a deficient number, since it is larger than the sum of its proper divisors (1344868633).

243421189631 is a wasteful number, since it uses less digits than its factorization.

243421189631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344868632.

The product of its digits is 248832, while the sum is 44.

The spelling of 243421189631 in words is "two hundred forty-three billion, four hundred twenty-one million, one hundred eighty-nine thousand, six hundred thirty-one".