2011129531 has 2 divisors, whose sum is σ = 2011129532. Its totient is φ = 2011129530.

The previous prime is 2011129513. The next prime is 2011129543. The reversal of 2011129531 is 1359211102.

Together with previous prime (2011129513) 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 2011129531 - 2⁷ = 2011129403 is a prime.

It is a super-2 number, since 2×2011129531² = 8089283980920559922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2011129496 and 2011129505.

It is not a weakly prime, because it can be changed into another prime (2011129231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005564765 + 1005564766.

It is an arithmetic number, because the mean of its divisors is an integer number (1005564766).

Almost surely, 2^2011129531 is an apocalyptic number.

2011129531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011129531 is an equidigital number, since it uses as much as digits as its factorization.

2011129531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 2011129531 is about 44845.6188607092. The cubic root of 2011129531 is about 1262.2537832566.

The spelling of 2011129531 in words is "two billion, eleven million, one hundred twenty-nine thousand, five hundred thirty-one".