1131082638 has 64 divisors (see below), whose sum is σ = 2724682752. Its totient is φ = 306028800.

The previous prime is 1131082619. The next prime is 1131082639. The reversal of 1131082638 is 8362801311.

It is a junction number, because it is equal to n+sod(n) for n = 1131082599 and 1131082608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131082639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91770 + ... + 103362.

It is an arithmetic number, because the mean of its divisors is an integer number (42573168).

Almost surely, 2^1131082638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131082638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362341376).

1131082638 is an abundant number, since it is smaller than the sum of its proper divisors (1593600114).

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

1131082638 is a wasteful number, since it uses less digits than its factorization.

1131082638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11729.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1131082638 is about 33631.5720417586. The cubic root of 1131082638 is about 1041.9129725935.

Adding to 1131082638 its reverse (8362801311), we get a palindrome (9493883949).

The spelling of 1131082638 in words is "one billion, one hundred thirty-one million, eighty-two thousand, six hundred thirty-eight".