1213404263 has 4 divisors (see below), whose sum is σ = 1252546368. Its totient is φ = 1174262160.

The previous prime is 1213404251. The next prime is 1213404287. The reversal of 1213404263 is 3624043121.

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 1213404263 - 2²² = 1209209959 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 (1213404293) 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, 19571006 + ... + 19571067.

It is an arithmetic number, because the mean of its divisors is an integer number (313136592).

Almost surely, 2^1213404263 is an apocalyptic number.

1213404263 is a deficient number, since it is larger than the sum of its proper divisors (39142105).

1213404263 is an equidigital number, since it uses as much as digits as its factorization.

1213404263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39142104.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1213404263 is about 34833.9527329300. The cubic root of 1213404263 is about 1066.6006371996.

Adding to 1213404263 its reverse (3624043121), we get a palindrome (4837447384).

The spelling of 1213404263 in words is "one billion, two hundred thirteen million, four hundred four thousand, two hundred sixty-three".