1091440897 has 16 divisors (see below), whose sum is σ = 1155358080. Its totient is φ = 1029548800.

The previous prime is 1091440891. The next prime is 1091440907. The reversal of 1091440897 is 7980441901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091440897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091440891) 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, 230322 + ... + 235012.

It is an arithmetic number, because the mean of its divisors is an integer number (72209880).

Almost surely, 2^1091440897 is an apocalyptic number.

It is an amenable number.

1091440897 is a deficient number, since it is larger than the sum of its proper divisors (63917183).

1091440897 is a wasteful number, since it uses less digits than its factorization.

1091440897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4904.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1091440897 is about 33036.9625873808. The cubic root of 1091440897 is about 1029.5957495533.

The spelling of 1091440897 in words is "one billion, ninety-one million, four hundred forty thousand, eight hundred ninety-seven".