1213531252 has 6 divisors (see below), whose sum is σ = 2123679698. Its totient is φ = 606765624.

The previous prime is 1213531223. The next prime is 1213531259. The reversal of 1213531252 is 2521353121.

It can be written as a sum of positive squares in only one way, i.e., 1061847396 + 151683856 = 32586^2 + 12316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213531259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151691403 + ... + 151691410.

Almost surely, 2^1213531252 is an apocalyptic number.

It is an amenable number.

1213531252 is a deficient number, since it is larger than the sum of its proper divisors (910148446).

1213531252 is a wasteful number, since it uses less digits than its factorization.

1213531252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303382817 (or 303382815 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 1213531252 is about 34835.7754614419. The cubic root of 1213531252 is about 1066.6378443167.

Adding to 1213531252 its reverse (2521353121), we get a palindrome (3734884373).

The spelling of 1213531252 in words is "one billion, two hundred thirteen million, five hundred thirty-one thousand, two hundred fifty-two".