1181997099 has 6 divisors (see below), whose sum is σ = 1707329156. Its totient is φ = 787998060.

The previous prime is 1181997083. The next prime is 1181997101. The reversal of 1181997099 is 9907991811.

It is a happy number.

1181997099 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1181997099 - 2⁴ = 1181997083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181997599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65666497 + ... + 65666514.

Almost surely, 2^1181997099 is an apocalyptic number.

1181997099 is a deficient number, since it is larger than the sum of its proper divisors (525332057).

1181997099 is a wasteful number, since it uses less digits than its factorization.

1181997099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131333017 (or 131333014 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 54.

The square root of 1181997099 is about 34380.1846853678. The cubic root of 1181997099 is about 1057.3176212486.

The spelling of 1181997099 in words is "one billion, one hundred eighty-one million, nine hundred ninety-seven thousand, ninety-nine".