231776782118257 has 2 divisors, whose sum is σ = 231776782118258. Its totient is φ = 231776782118256.

The previous prime is 231776782118209. The next prime is 231776782118269. The reversal of 231776782118257 is 752811287677132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116807006137441 + 114969775980816 = 10807729^2 + 10722396^2 .

It is a cyclic number.

It is not a de Polignac number, because 231776782118257 - 2¹⁵ = 231776782085489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231776782118192 and 231776782118201.

It is not a weakly prime, because it can be changed into another prime (231776782118957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115888391059128 + 115888391059129.

It is an arithmetic number, because the mean of its divisors is an integer number (115888391059129).

Almost surely, 2^{231776782118257} is an apocalyptic number.

It is an amenable number.

231776782118257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231776782118257 is an equidigital number, since it uses as much as digits as its factorization.

231776782118257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110638080, while the sum is 67.

The spelling of 231776782118257 in words is "two hundred thirty-one trillion, seven hundred seventy-six billion, seven hundred eighty-two million, one hundred eighteen thousand, two hundred fifty-seven".