1313021331 has 12 divisors (see below), whose sum is σ = 1947845952. Its totient is φ = 851689296.

The previous prime is 1313021329. The next prime is 1313021357. The reversal of 1313021331 is 1331203131.

It is a happy number.

1313021331 is a `hidden beast` number, since 1 + 31 + 302 + 1 + 331 = 666.

It is not a de Polignac number, because 1313021331 - 2¹ = 1313021329 is a prime.

It is a super-2 number, since 2×1313021331² = 3448050031322023122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1313021321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1971171 + ... + 1971836.

It is an arithmetic number, because the mean of its divisors is an integer number (162320496).

Almost surely, 2^1313021331 is an apocalyptic number.

1313021331 is a deficient number, since it is larger than the sum of its proper divisors (634824621).

1313021331 is a wasteful number, since it uses less digits than its factorization.

1313021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943050 (or 3943047 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1313021331 is about 36235.6362025010. The cubic root of 1313021331 is about 1095.0247295347.

Adding to 1313021331 its reverse (1331203131), we get a palindrome (2644224462).

The spelling of 1313021331 in words is "one billion, three hundred thirteen million, twenty-one thousand, three hundred thirty-one".