1198291811 has 4 divisors (see below), whose sum is σ = 1202713824. Its totient is φ = 1193869800.

The previous prime is 1198291807. The next prime is 1198291873. The reversal of 1198291811 is 1181928911.

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 1198291811 - 2² = 1198291807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198290811) 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, 2210600 + ... + 2211141.

It is an arithmetic number, because the mean of its divisors is an integer number (300678456).

Almost surely, 2^1198291811 is an apocalyptic number.

1198291811 is a deficient number, since it is larger than the sum of its proper divisors (4422013).

1198291811 is an equidigital number, since it uses as much as digits as its factorization.

1198291811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422012.

The product of its digits is 10368, while the sum is 41.

The square root of 1198291811 is about 34616.3517864029. The cubic root of 1198291811 is about 1062.1541014944.

The spelling of 1198291811 in words is "one billion, one hundred ninety-eight million, two hundred ninety-one thousand, eight hundred eleven".