1211431163 has 2 divisors, whose sum is σ = 1211431164. Its totient is φ = 1211431162.

The previous prime is 1211431093. The next prime is 1211431189. The reversal of 1211431163 is 3611341121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211431163 - 2¹⁶ = 1211365627 is a prime.

It is a super-3 number, since 3×1211431163³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1211431363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605715581 + 605715582.

It is an arithmetic number, because the mean of its divisors is an integer number (605715582).

Almost surely, 2^1211431163 is an apocalyptic number.

1211431163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211431163 is an equidigital number, since it uses as much as digits as its factorization.

1211431163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 1211431163 is about 34805.6197042949. The cubic root of 1211431163 is about 1066.0221953404.

Adding to 1211431163 its reverse (3611341121), we get a palindrome (4822772284).

The spelling of 1211431163 in words is "one billion, two hundred eleven million, four hundred thirty-one thousand, one hundred sixty-three".