1211140631 has 2 divisors, whose sum is σ = 1211140632. Its totient is φ = 1211140630.

The previous prime is 1211140627. The next prime is 1211140669. The reversal of 1211140631 is 1360411121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1360411121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211140631 - 2² = 1211140627 is a prime.

It is a super-2 number, since 2×1211140631² = 2933723256118156322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211140621) 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, 605570315 + 605570316.

It is an arithmetic number, because the mean of its divisors is an integer number (605570316).

Almost surely, 2^1211140631 is an apocalyptic number.

1211140631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211140631 is an equidigital number, since it uses as much as digits as its factorization.

1211140631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1211140631 is about 34801.4458176668. The cubic root of 1211140631 is about 1065.9369687829.

Adding to 1211140631 its reverse (1360411121), we get a palindrome (2571551752).

The spelling of 1211140631 in words is "one billion, two hundred eleven million, one hundred forty thousand, six hundred thirty-one".