1199998881 has 21 divisors (see below), whose sum is σ = 1800578689. Its totient is φ = 799375716.

The previous prime is 1199998879. The next prime is 1199998889. The reversal of 1199998881 is 1888999911.

The square root of 1199998881 is 34641.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1199998881 - 2¹ = 1199998879 is a prime.

It is a super-3 number, since 3×1199998881³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1199998889) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 934666 + ... + 935948.

Almost surely, 2^1199998881 is an apocalyptic number.

1199998881 is the 34641-st square number.

1199998881 is the 17321-st centered octagonal number.

It is an amenable number.

1199998881 is a deficient number, since it is larger than the sum of its proper divisors (600579808).

1199998881 is an frugal number, since it uses more digits than its factorization.

1199998881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 1286 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 63.

The cubic root of 1199998881 is about 1062.6582388728.

The spelling of 1199998881 in words is "one billion, one hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred eighty-one".