1213312465 has 4 divisors (see below), whose sum is σ = 1455974964. Its totient is φ = 970649968.

The previous prime is 1213312459. The next prime is 1213312489. The reversal of 1213312465 is 5642133121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 367258896 + 846053569 = 19164^2 + 29087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213312465 - 2⁵ = 1213312433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121331242 + ... + 121331251.

It is an arithmetic number, because the mean of its divisors is an integer number (363993741).

Almost surely, 2^1213312465 is an apocalyptic number.

It is an amenable number.

1213312465 is a deficient number, since it is larger than the sum of its proper divisors (242662499).

1213312465 is an equidigital number, since it uses as much as digits as its factorization.

1213312465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242662498.

The product of its digits is 4320, while the sum is 28.

The square root of 1213312465 is about 34832.6350567970. The cubic root of 1213312465 is about 1066.5737392460.

Adding to 1213312465 its reverse (5642133121), we get a palindrome (6855445586).

The spelling of 1213312465 in words is "one billion, two hundred thirteen million, three hundred twelve thousand, four hundred sixty-five".