1012311281 has 2 divisors, whose sum is σ = 1012311282. Its totient is φ = 1012311280.

The previous prime is 1012311263. The next prime is 1012311299. The reversal of 1012311281 is 1821132101.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1012311263) and next prime (1012311299).

It can be written as a sum of positive squares in only one way, i.e., 984390625 + 27920656 = 31375^2 + 5284^2 .

It is an emirp because it is prime and its reverse (1821132101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012311281 - 2²⁶ = 945202417 is a prime.

It is a super-2 number, since 2×1012311281² = 2049548259279721922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1012317281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506155640 + 506155641.

It is an arithmetic number, because the mean of its divisors is an integer number (506155641).

Almost surely, 2^1012311281 is an apocalyptic number.

It is an amenable number.

1012311281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012311281 is an equidigital number, since it uses as much as digits as its factorization.

1012311281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1012311281 is about 31816.8395822087. The cubic root of 1012311281 is about 1004.0870337322.

Adding to 1012311281 its reverse (1821132101), we get a palindrome (2833443382).

The spelling of 1012311281 in words is "one billion, twelve million, three hundred eleven thousand, two hundred eighty-one".