1091529040 has 80 divisors (see below), whose sum is σ = 2905885440. Its totient is φ = 373524480.

The previous prime is 1091528993. The next prime is 1091529041. The reversal of 1091529040 is 409251901.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1091528993 and 1091529011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091529041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351816 + ... + 354904.

It is an arithmetic number, because the mean of its divisors is an integer number (36323568).

Almost surely, 2^1091529040 is an apocalyptic number.

1091529040 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 1091529040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1452942720).

1091529040 is an abundant number, since it is smaller than the sum of its proper divisors (1814356400).

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

1091529040 is a wasteful number, since it uses less digits than its factorization.

1091529040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740 (or 3734 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1091529040 is about 33038.2965662578. The cubic root of 1091529040 is about 1029.6234649692.

The spelling of 1091529040 in words is "one billion, ninety-one million, five hundred twenty-nine thousand, forty".