1081299456 has 140 divisors (see below), whose sum is σ = 3240366822. Its totient is φ = 360308736.

The previous prime is 1081299451. The next prime is 1081299493. The reversal of 1081299456 is 6549921801.

1081299456 is a `hidden beast` number, since 108 + 1 + 2 + 99 + 456 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1049760000 + 31539456 = 32400^2 + 5616^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081299451) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 371800 + ... + 374696.

Almost surely, 2^1081299456 is an apocalyptic number.

1081299456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081299456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620183411).

1081299456 is an abundant number, since it is smaller than the sum of its proper divisors (2159067366).

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

1081299456 is an frugal number, since it uses more digits than its factorization.

1081299456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933 (or 2902 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1081299456 is about 32883.1181003262. The cubic root of 1081299456 is about 1026.3968916937.

The spelling of 1081299456 in words is "one billion, eighty-one million, two hundred ninety-nine thousand, four hundred fifty-six".