11156240281 has 2 divisors, whose sum is σ = 11156240282. Its totient is φ = 11156240280.

The previous prime is 11156240201. The next prime is 11156240299. The reversal of 11156240281 is 18204265111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9903434256 + 1252806025 = 99516^2 + 35395^2 .

It is an emirp because it is prime and its reverse (18204265111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11156240281 - 2¹³ = 11156232089 is a prime.

It is a super-2 number, since 2×11156240281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11156240201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5578120140 + 5578120141.

It is an arithmetic number, because the mean of its divisors is an integer number (5578120141).

Almost surely, 2^11156240281 is an apocalyptic number.

It is an amenable number.

11156240281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11156240281 is an equidigital number, since it uses as much as digits as its factorization.

11156240281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 11156240281 in words is "eleven billion, one hundred fifty-six million, two hundred forty thousand, two hundred eighty-one".