231138049 has 2 divisors, whose sum is σ = 231138050. Its totient is φ = 231138048.

The previous prime is 231138013. The next prime is 231138101. The reversal of 231138049 is 940831132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221057424 + 10080625 = 14868^2 + 3175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231138049 is a prime.

It is equal to p_12701758 and since 231138049 and 12701758 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231138049.

It is not a weakly prime, because it can be changed into another prime (231138949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115569024 + 115569025.

It is an arithmetic number, because the mean of its divisors is an integer number (115569025).

Almost surely, 2^231138049 is an apocalyptic number.

It is an amenable number.

231138049 is a deficient number, since it is larger than the sum of its proper divisors (1).

231138049 is an equidigital number, since it uses as much as digits as its factorization.

231138049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 231138049 is about 15203.2249539366. The cubic root of 231138049 is about 613.7014476216.

The spelling of 231138049 in words is "two hundred thirty-one million, one hundred thirty-eight thousand, forty-nine".