1213504423 has 4 divisors (see below), whose sum is σ = 1213575480. Its totient is φ = 1213433368.

The previous prime is 1213504379. The next prime is 1213504427. The reversal of 1213504423 is 3244053121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1213504423 - 2²¹ = 1211407271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213504427) 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, 7293 + ... + 49801.

It is an arithmetic number, because the mean of its divisors is an integer number (303393870).

Almost surely, 2^1213504423 is an apocalyptic number.

1213504423 is a deficient number, since it is larger than the sum of its proper divisors (71057).

1213504423 is an equidigital number, since it uses as much as digits as its factorization.

1213504423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71056.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1213504423 is about 34835.3903810478. The cubic root of 1213504423 is about 1066.6299837754.

Adding to 1213504423 its reverse (3244053121), we get a palindrome (4457557544).

The spelling of 1213504423 in words is "one billion, two hundred thirteen million, five hundred four thousand, four hundred twenty-three".