1081259816 has 64 divisors (see below), whose sum is σ = 2548385280. Its totient is φ = 418636800.

The previous prime is 1081259813. The next prime is 1081259899. The reversal of 1081259816 is 6189521801.

It is not an unprimeable number, because it can be changed into a prime (1081259813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18416 + ... + 50016.

It is an arithmetic number, because the mean of its divisors is an integer number (39818520).

Almost surely, 2^1081259816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081259816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1274192640).

1081259816 is an abundant number, since it is smaller than the sum of its proper divisors (1467125464).

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

1081259816 is a wasteful number, since it uses less digits than its factorization.

1081259816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31674 (or 31670 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 1081259816 is about 32882.5153539081. The cubic root of 1081259816 is about 1026.3843491090.

The spelling of 1081259816 in words is "one billion, eighty-one million, two hundred fifty-nine thousand, eight hundred sixteen".