231312178949 has 2 divisors, whose sum is σ = 231312178950. Its totient is φ = 231312178948.

The previous prime is 231312178943. The next prime is 231312178963. The reversal of 231312178949 is 949871213132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191478006724 + 39834172225 = 437582^2 + 199585^2 .

It is a cyclic number.

It is not a de Polignac number, because 231312178949 - 2¹⁶ = 231312113413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231312178897 and 231312178906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231312178943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656089474 + 115656089475.

It is an arithmetic number, because the mean of its divisors is an integer number (115656089475).

Almost surely, 2^231312178949 is an apocalyptic number.

It is an amenable number.

231312178949 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312178949 is an equidigital number, since it uses as much as digits as its factorization.

231312178949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The spelling of 231312178949 in words is "two hundred thirty-one billion, three hundred twelve million, one hundred seventy-eight thousand, nine hundred forty-nine".