231783728251 has 2 divisors, whose sum is σ = 231783728252. Its totient is φ = 231783728250.

The previous prime is 231783728171. The next prime is 231783728279. The reversal of 231783728251 is 152827387132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231783728251 - 2¹¹ = 231783726203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231783728195 and 231783728204.

It is not a weakly prime, because it can be changed into another prime (231783128251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115891864125 + 115891864126.

It is an arithmetic number, because the mean of its divisors is an integer number (115891864126).

Almost surely, 2^231783728251 is an apocalyptic number.

231783728251 is a deficient number, since it is larger than the sum of its proper divisors (1).

231783728251 is an equidigital number, since it uses as much as digits as its factorization.

231783728251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 49.

The spelling of 231783728251 in words is "two hundred thirty-one billion, seven hundred eighty-three million, seven hundred twenty-eight thousand, two hundred fifty-one".