1081155538 has 8 divisors (see below), whose sum is σ = 1622044620. Its totient is φ = 540474000.

The previous prime is 1081155469. The next prime is 1081155539. The reversal of 1081155538 is 8355511801.

It can be written as a sum of positive squares in 2 ways, for example, as 1080239689 + 915849 = 32867^2 + 957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1081155497 and 1081155506.

It is not an unprimeable number, because it can be changed into a prime (1081155539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38133 + ... + 60136.

Almost surely, 2^1081155538 is an apocalyptic number.

1081155538 is a deficient number, since it is larger than the sum of its proper divisors (540889082).

1081155538 is an equidigital number, since it uses as much as digits as its factorization.

1081155538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103772.

The product of its (nonzero) digits is 24000, while the sum is 37.

The square root of 1081155538 is about 32880.9297009680. The cubic root of 1081155538 is about 1026.3513528003.

The spelling of 1081155538 in words is "one billion, eighty-one million, one hundred fifty-five thousand, five hundred thirty-eight".