1331163521 has 2 divisors, whose sum is σ = 1331163522. Its totient is φ = 1331163520.

The previous prime is 1331163511. The next prime is 1331163557. The reversal of 1331163521 is 1253611331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1236295921 + 94867600 = 35161^2 + 9740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331163521 - 2¹⁴ = 1331147137 is a prime.

It is a super-2 number, since 2×1331163521² = 3543992639282234882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331163511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665581760 + 665581761.

It is an arithmetic number, because the mean of its divisors is an integer number (665581761).

Almost surely, 2^1331163521 is an apocalyptic number.

It is an amenable number.

1331163521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331163521 is an equidigital number, since it uses as much as digits as its factorization.

1331163521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 1331163521 is about 36485.1136903806. The cubic root of 1331163521 is about 1100.0450452628.

Adding to 1331163521 its reverse (1253611331), we get a palindrome (2584774852).

The spelling of 1331163521 in words is "one billion, three hundred thirty-one million, one hundred sixty-three thousand, five hundred twenty-one".