1211312423 has 4 divisors (see below), whose sum is σ = 1211429280. Its totient is φ = 1211195568.

The previous prime is 1211312419. The next prime is 1211312437. The reversal of 1211312423 is 3242131121.

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 1211312423 - 2² = 1211312419 is a prime.

It is a super-2 number, since 2×1211312423² = 2934555572228261858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211312395 and 1211312404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41183 + ... + 64176.

It is an arithmetic number, because the mean of its divisors is an integer number (302857320).

Almost surely, 2^1211312423 is an apocalyptic number.

1211312423 is a deficient number, since it is larger than the sum of its proper divisors (116857).

1211312423 is a wasteful number, since it uses less digits than its factorization.

1211312423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116856.

The product of its digits is 288, while the sum is 20.

The square root of 1211312423 is about 34803.9139034678. The cubic root of 1211312423 is about 1065.9873650187.

Adding to 1211312423 its reverse (3242131121), we get a palindrome (4453443544).

The spelling of 1211312423 in words is "one billion, two hundred eleven million, three hundred twelve thousand, four hundred twenty-three".