1311303252 has 48 divisors (see below), whose sum is σ = 3501099392. Its totient is φ = 374198400.

The previous prime is 1311303247. The next prime is 1311303271. The reversal of 1311303252 is 2523031131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62502 + ... + 80802.

Almost surely, 2^1311303252 is an apocalyptic number.

1311303252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311303252 is an abundant number, since it is smaller than the sum of its proper divisors (2189796140).

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

1311303252 is a wasteful number, since it uses less digits than its factorization.

1311303252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19168 (or 19166 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1311303252 is about 36211.9214071830. The cubic root of 1311303252 is about 1094.5469103966.

Adding to 1311303252 its reverse (2523031131), we get a palindrome (3834334383).

The spelling of 1311303252 in words is "one billion, three hundred eleven million, three hundred three thousand, two hundred fifty-two".