1212233513 has 4 divisors (see below), whose sum is σ = 1212309588. Its totient is φ = 1212157440.

The previous prime is 1212233413. The next prime is 1212233531. The reversal of 1212233513 is 3153322121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3153322121 = 4799 ⋅657079.

It can be written as a sum of positive squares in 2 ways, for example, as 818131609 + 394101904 = 28603^2 + 19852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212233513 - 2¹⁴ = 1212217129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212233413) 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, 3956 + ... + 49397.

It is an arithmetic number, because the mean of its divisors is an integer number (303077397).

Almost surely, 2^1212233513 is an apocalyptic number.

It is an amenable number.

1212233513 is a deficient number, since it is larger than the sum of its proper divisors (76075).

1212233513 is an equidigital number, since it uses as much as digits as its factorization.

1212233513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76074.

The product of its digits is 1080, while the sum is 23.

The square root of 1212233513 is about 34817.1439523692. The cubic root of 1212233513 is about 1066.2574911824.

Adding to 1212233513 its reverse (3153322121), we get a palindrome (4365555634).

The spelling of 1212233513 in words is "one billion, two hundred twelve million, two hundred thirty-three thousand, five hundred thirteen".