11281813531 has 2 divisors, whose sum is σ = 11281813532. Its totient is φ = 11281813530.

The previous prime is 11281813493. The next prime is 11281813583. The reversal of 11281813531 is 13531818211.

It is a weak prime.

It is an emirp because it is prime and its reverse (13531818211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11281813531 - 2²⁷ = 11147595803 is a prime.

It is a super-2 number, since 2×11281813531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11281817531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5640906765 + 5640906766.

It is an arithmetic number, because the mean of its divisors is an integer number (5640906766).

Almost surely, 2^11281813531 is an apocalyptic number.

11281813531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11281813531 is an equidigital number, since it uses as much as digits as its factorization.

11281813531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

The spelling of 11281813531 in words is "eleven billion, two hundred eighty-one million, eight hundred thirteen thousand, five hundred thirty-one".