1211310131 has 2 divisors, whose sum is σ = 1211310132. Its totient is φ = 1211310130.

The previous prime is 1211310083. The next prime is 1211310137. The reversal of 1211310131 is 1310131121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211310131 - 2¹⁰ = 1211309107 is a prime.

It is a super-2 number, since 2×1211310131² = 2934544466926474322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211310137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605655065 + 605655066.

It is an arithmetic number, because the mean of its divisors is an integer number (605655066).

Almost surely, 2^1211310131 is an apocalyptic number.

1211310131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211310131 is an equidigital number, since it uses as much as digits as its factorization.

1211310131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1211310131 is about 34803.8809761210. The cubic root of 1211310131 is about 1065.9866926778.

Adding to 1211310131 its reverse (1310131121), we get a palindrome (2521441252).

It can be divided in two parts, 121 and 1310131, that multiplied together give a palindrome (158525851).

The spelling of 1211310131 in words is "one billion, two hundred eleven million, three hundred ten thousand, one hundred thirty-one".