1213131205 has 64 divisors (see below), whose sum is σ = 1811496960. Its totient is φ = 767289600.

The previous prime is 1213131197. The next prime is 1213131211. The reversal of 1213131205 is 5021313121.

It is not a de Polignac number, because 1213131205 - 2³ = 1213131197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1167076 + ... + 1168114.

It is an arithmetic number, because the mean of its divisors is an integer number (28304640).

Almost surely, 2^1213131205 is an apocalyptic number.

It is an amenable number.

1213131205 is a deficient number, since it is larger than the sum of its proper divisors (598365755).

1213131205 is a wasteful number, since it uses less digits than its factorization.

1213131205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1213131205 is about 34830.0330892751. The cubic root of 1213131205 is about 1066.5206238314.

Adding to 1213131205 its reverse (5021313121), we get a palindrome (6234444326).

The spelling of 1213131205 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred five".