243723634381 has 2 divisors, whose sum is σ = 243723634382. Its totient is φ = 243723634380.

The previous prime is 243723634369. The next prime is 243723634393. The reversal of 243723634381 is 183436327342.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (243723634369) and next prime (243723634393).

It can be written as a sum of positive squares in only one way, i.e., 220932901225 + 22790733156 = 470035^2 + 150966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243723634381 is a prime.

It is a super-2 number, since 2×243723634381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243723634321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121861817190 + 121861817191.

It is an arithmetic number, because the mean of its divisors is an integer number (121861817191).

Almost surely, 2^243723634381 is an apocalyptic number.

It is an amenable number.

243723634381 is a deficient number, since it is larger than the sum of its proper divisors (1).

243723634381 is an equidigital number, since it uses as much as digits as its factorization.

243723634381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 46.

The spelling of 243723634381 in words is "two hundred forty-three billion, seven hundred twenty-three million, six hundred thirty-four thousand, three hundred eighty-one".