11181640531 has 2 divisors, whose sum is σ = 11181640532. Its totient is φ = 11181640530.

The previous prime is 11181640513. The next prime is 11181640541. The reversal of 11181640531 is 13504618111.

Together with previous prime (11181640513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11181640531 - 2¹³ = 11181632339 is a prime.

It is a super-2 number, since 2×11181640531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11181640493 and 11181640502.

It is not a weakly prime, because it can be changed into another prime (11181640501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590820265 + 5590820266.

It is an arithmetic number, because the mean of its divisors is an integer number (5590820266).

Almost surely, 2^11181640531 is an apocalyptic number.

11181640531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181640531 is an equidigital number, since it uses as much as digits as its factorization.

11181640531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The spelling of 11181640531 in words is "eleven billion, one hundred eighty-one million, six hundred forty thousand, five hundred thirty-one".