1091543040 has 560 divisors, whose sum is σ = 4567318272. Its totient is φ = 244187136.

The previous prime is 1091543017. The next prime is 1091543053. The reversal of 1091543040 is 403451901.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1091542995 and 1091543013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23224297 + ... + 23224343.

Almost surely, 2^1091543040 is an apocalyptic number.

1091543040 is a gapful number since it is divisible by the number (10) 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 1091543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283659136).

1091543040 is an abundant number, since it is smaller than the sum of its proper divisors (3475775232).

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

1091543040 is an frugal number, since it uses more digits than its factorization.

1091543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1091543040 is about 33038.5084409088. The cubic root of 1091543040 is about 1029.6278669491.

Adding to 1091543040 its reverse (403451901), we get a palindrome (1494994941).

The spelling of 1091543040 in words is "one billion, ninety-one million, five hundred forty-three thousand, forty".