11005531 has 2 divisors, whose sum is σ = 11005532. Its totient is φ = 11005530.

The previous prime is 11005513. The next prime is 11005537. The reversal of 11005531 is 13550011.

Together with previous prime (11005513) 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 11005531 - 2⁹ = 11005019 is a prime.

It is a super-2 number, since 2×11005531² = 242243425183922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11005537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5502765 + 5502766.

It is an arithmetic number, because the mean of its divisors is an integer number (5502766).

Almost surely, 2^11005531 is an apocalyptic number.

11005531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11005531 is an equidigital number, since it uses as much as digits as its factorization.

11005531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75, while the sum is 16.

The square root of 11005531 is about 3317.4585151890. The cubic root of 11005531 is about 222.4352780653.

Adding to 11005531 its reverse (13550011), we get a palindrome (24555542).

The spelling of 11005531 in words is "eleven million, five thousand, five hundred thirty-one".