1213423523 has 4 divisors (see below), whose sum is σ = 1306763808. Its totient is φ = 1120083240.

The previous prime is 1213423469. The next prime is 1213423531. The reversal of 1213423523 is 3253243121.

It is a happy number.

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 1213423523 - 2⁶ = 1213423459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213423492 and 1213423501.

It is not an unprimeable number, because it can be changed into a prime (1213423553) 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, 46670123 + ... + 46670148.

It is an arithmetic number, because the mean of its divisors is an integer number (326690952).

Almost surely, 2^1213423523 is an apocalyptic number.

1213423523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213423523 is a deficient number, since it is larger than the sum of its proper divisors (93340285).

1213423523 is an equidigital number, since it uses as much as digits as its factorization.

1213423523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93340284.

The product of its digits is 4320, while the sum is 26.

The square root of 1213423523 is about 34834.2291862473. The cubic root of 1213423523 is about 1066.6062804465.

Adding to 1213423523 its reverse (3253243121), we get a palindrome (4466666644).

The spelling of 1213423523 in words is "one billion, two hundred thirteen million, four hundred twenty-three thousand, five hundred twenty-three".