1205531213 has 8 divisors (see below), whose sum is σ = 1212112608. Its totient is φ = 1198967184.

The previous prime is 1205531207. The next prime is 1205531219. The reversal of 1205531213 is 3121355021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1205531207) and next prime (1205531219).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205531213 - 2²⁶ = 1138422349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205531219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149306 + ... + 157172.

It is an arithmetic number, because the mean of its divisors is an integer number (151514076).

Almost surely, 2^1205531213 is an apocalyptic number.

It is an amenable number.

1205531213 is a deficient number, since it is larger than the sum of its proper divisors (6581395).

1205531213 is an equidigital number, since it uses as much as digits as its factorization.

1205531213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8683.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1205531213 is about 34720.7605475456. The cubic root of 1205531213 is about 1064.2887866901.

Adding to 1205531213 its reverse (3121355021), we get a palindrome (4326886234).

The spelling of 1205531213 in words is "one billion, two hundred five million, five hundred thirty-one thousand, two hundred thirteen".