243123898931 has 2 divisors, whose sum is σ = 243123898932. Its totient is φ = 243123898930.

The previous prime is 243123898879. The next prime is 243123898951. The reversal of 243123898931 is 139898321342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243123898931 - 2¹⁸ = 243123636787 is a prime.

It is a super-2 number, since 2×243123898931² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243123898951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561949465 + 121561949466.

It is an arithmetic number, because the mean of its divisors is an integer number (121561949466).

Almost surely, 2^243123898931 is an apocalyptic number.

243123898931 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123898931 is an equidigital number, since it uses as much as digits as its factorization.

243123898931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 53.

The spelling of 243123898931 in words is "two hundred forty-three billion, one hundred twenty-three million, eight hundred ninety-eight thousand, nine hundred thirty-one".