1198998911 has 4 divisors (see below), whose sum is σ = 1307998824. Its totient is φ = 1089999000.

The previous prime is 1198998883. The next prime is 1198998917.

1198998911 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1198998911 - 2⁶ = 1198998847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198998917) 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, 54499940 + ... + 54499961.

It is an arithmetic number, because the mean of its divisors is an integer number (326999706).

Almost surely, 2^1198998911 is an apocalyptic number.

1198998911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1198998911 is a deficient number, since it is larger than the sum of its proper divisors (108999913).

1198998911 is a wasteful number, since it uses less digits than its factorization.

1198998911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108999912.

The product of its digits is 419904, while the sum is 56.

The square root of 1198998911 is about 34626.5636614435. The cubic root of 1198998911 is about 1062.3629825805.

The spelling of 1198998911 in words is "one billion, one hundred ninety-eight million, nine hundred ninety-eight thousand, nine hundred eleven".