1213405433 has 4 divisors (see below), whose sum is σ = 1241624208. Its totient is φ = 1185186660.

The previous prime is 1213405421. The next prime is 1213405451. The reversal of 1213405433 is 3345043121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213405433 - 2¹⁸ = 1213143289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213405463) 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, 14109323 + ... + 14109408.

It is an arithmetic number, because the mean of its divisors is an integer number (310406052).

Almost surely, 2^1213405433 is an apocalyptic number.

It is an amenable number.

1213405433 is a deficient number, since it is larger than the sum of its proper divisors (28218775).

1213405433 is an equidigital number, since it uses as much as digits as its factorization.

1213405433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28218774.

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

The square root of 1213405433 is about 34833.9695268857. The cubic root of 1213405433 is about 1066.6009800153.

Adding to 1213405433 its reverse (3345043121), we get a palindrome (4558448554).

The spelling of 1213405433 in words is "one billion, two hundred thirteen million, four hundred five thousand, four hundred thirty-three".