1191212023 has 4 divisors (see below), whose sum is σ = 1193976288. Its totient is φ = 1188447760.

The previous prime is 1191211999. The next prime is 1191212027. The reversal of 1191212023 is 3202121911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3202121911 = 107 ⋅29926373.

It is a cyclic number.

It is not a de Polignac number, because 1191212023 - 2²⁹ = 654341111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1191211985 and 1191212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191212027) 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, 1381486 + ... + 1382347.

It is an arithmetic number, because the mean of its divisors is an integer number (298494072).

Almost surely, 2^1191212023 is an apocalyptic number.

1191212023 is a deficient number, since it is larger than the sum of its proper divisors (2764265).

1191212023 is an equidigital number, since it uses as much as digits as its factorization.

1191212023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764264.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1191212023 is about 34513.9395462181. The cubic root of 1191212023 is about 1060.0581500673.

Adding to 1191212023 its reverse (3202121911), we get a palindrome (4393333934).

The spelling of 1191212023 in words is "one billion, one hundred ninety-one million, two hundred twelve thousand, twenty-three".