2011115531 has 2 divisors, whose sum is σ = 2011115532. Its totient is φ = 2011115530.

The previous prime is 2011115507. The next prime is 2011115543. The reversal of 2011115531 is 1355111102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011115531 - 2³⁰ = 937373707 is a prime.

It is a super-2 number, since 2×2011115531² = 8089171358058823922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2011112531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005557765 + 1005557766.

It is an arithmetic number, because the mean of its divisors is an integer number (1005557766).

Almost surely, 2^2011115531 is an apocalyptic number.

2011115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011115531 is an equidigital number, since it uses as much as digits as its factorization.

2011115531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 2011115531 is about 44845.4627693817. The cubic root of 2011115531 is about 1262.2508542899.

Adding to 2011115531 its reverse (1355111102), we get a palindrome (3366226633).

The spelling of 2011115531 in words is "two billion, eleven million, one hundred fifteen thousand, five hundred thirty-one".