1213205532 has 72 divisors (see below), whose sum is σ = 3556092288. Its totient is φ = 315115680.

The previous prime is 1213205507. The next prime is 1213205549. The reversal of 1213205532 is 2355023121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49518 + ... + 69845.

Almost surely, 2^1213205532 is an apocalyptic number.

1213205532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213205532 is an abundant number, since it is smaller than the sum of its proper divisors (2342886756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213205532 is a wasteful number, since it uses less digits than its factorization.

1213205532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119399 (or 119386 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1213205532 is about 34831.1000687604. The cubic root of 1213205532 is about 1066.5424048389.

Adding to 1213205532 its reverse (2355023121), we get a palindrome (3568228653).

The spelling of 1213205532 in words is "one billion, two hundred thirteen million, two hundred five thousand, five hundred thirty-two".