1099820897 has 4 divisors (see below), whose sum is σ = 1256938176. Its totient is φ = 942703620.

The previous prime is 1099820881. The next prime is 1099820921. The reversal of 1099820897 is 7980289901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1099820897 - 2⁴ = 1099820881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099820837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78558629 + ... + 78558642.

It is an arithmetic number, because the mean of its divisors is an integer number (314234544).

Almost surely, 2^1099820897 is an apocalyptic number.

It is an amenable number.

1099820897 is a deficient number, since it is larger than the sum of its proper divisors (157117279).

1099820897 is an equidigital number, since it uses as much as digits as its factorization.

1099820897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157117278.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 1099820897 is about 33163.5477143203. The cubic root of 1099820897 is about 1032.2240868198.

The spelling of 1099820897 in words is "one billion, ninety-nine million, eight hundred twenty thousand, eight hundred ninety-seven".