1213131423 has 8 divisors (see below), whose sum is σ = 1848581248. Its totient is φ = 693217944.

The previous prime is 1213131419. The next prime is 1213131427. The reversal of 1213131423 is 3241313121.

It is an interprime number because it is at equal distance from previous prime (1213131419) and next prime (1213131427).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213131423 - 2² = 1213131419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 57768163 = 1213131423 / (1 + 2 + 1 + 3 + 1 + 3 + 1 + 4 + 2 + 3).

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 1213131423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213131427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28884061 + ... + 28884102.

It is an arithmetic number, because the mean of its divisors is an integer number (231072656).

Almost surely, 2^1213131423 is an apocalyptic number.

1213131423 is a deficient number, since it is larger than the sum of its proper divisors (635449825).

1213131423 is an equidigital number, since it uses as much as digits as its factorization.

1213131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57768173.

The product of its digits is 432, while the sum is 21.

The square root of 1213131423 is about 34830.0362187581. The cubic root of 1213131423 is about 1066.5206877161.

Adding to 1213131423 its reverse (3241313121), we get a palindrome (4454444544).

The spelling of 1213131423 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, four hundred twenty-three".