1189966811 has 16 divisors (see below), whose sum is σ = 1322784000. Its totient is φ = 1061330400.

The previous prime is 1189966807. The next prime is 1189966849. The reversal of 1189966811 is 1186699811.

It is a cyclic number.

It is not a de Polignac number, because 1189966811 - 2² = 1189966807 is a prime.

It is a super-2 number, since 2×1189966811² = 2832042022563019442, which contains 22 as substring.

1189966811 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1189966811.

It is not an unprimeable number, because it can be changed into a prime (1189966861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387221 + ... + 390281.

It is an arithmetic number, because the mean of its divisors is an integer number (82674000).

Almost surely, 2^1189966811 is an apocalyptic number.

1189966811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1189966811 is a deficient number, since it is larger than the sum of its proper divisors (132817189).

1189966811 is a wasteful number, since it uses less digits than its factorization.

1189966811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730.

The product of its digits is 186624, while the sum is 50.

The square root of 1189966811 is about 34495.8955674440. The cubic root of 1189966811 is about 1059.6886503992.

The spelling of 1189966811 in words is "one billion, one hundred eighty-nine million, nine hundred sixty-six thousand, eight hundred eleven".