1211531327 has 2 divisors, whose sum is σ = 1211531328. Its totient is φ = 1211531326.

The previous prime is 1211531323. The next prime is 1211531339. The reversal of 1211531327 is 7231351121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211531327 - 2² = 1211531323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211531296 and 1211531305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211531323) 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, 605765663 + 605765664.

It is an arithmetic number, because the mean of its divisors is an integer number (605765664).

Almost surely, 2^1211531327 is an apocalyptic number.

1211531327 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211531327 is an equidigital number, since it uses as much as digits as its factorization.

1211531327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 26.

The square root of 1211531327 is about 34807.0585801214. The cubic root of 1211531327 is about 1066.0515749446.

Adding to 1211531327 its reverse (7231351121), we get a palindrome (8442882448).

The spelling of 1211531327 in words is "one billion, two hundred eleven million, five hundred thirty-one thousand, three hundred twenty-seven".