2011631636 has 24 divisors (see below), whose sum is σ = 4030985280. Its totient is φ = 860473152.

The previous prime is 2011631623. The next prime is 2011631639. The reversal of 2011631636 is 6361361102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2011631599 and 2011631608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011631639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54041 + ... + 83328.

It is an arithmetic number, because the mean of its divisors is an integer number (167957720).

Almost surely, 2^2011631636 is an apocalyptic number.

It is an amenable number.

2011631636 is an abundant number, since it is smaller than the sum of its proper divisors (2019353644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2011631636 is a wasteful number, since it uses less digits than its factorization.

2011631636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137903 (or 137901 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 2011631636 is about 44851.2166613125. The cubic root of 2011631636 is about 1262.3588206148.

Adding to 2011631636 its reverse (6361361102), we get a palindrome (8372992738).

The spelling of 2011631636 in words is "two billion, eleven million, six hundred thirty-one thousand, six hundred thirty-six".