1031513521 has 2 divisors, whose sum is σ = 1031513522. Its totient is φ = 1031513520.

The previous prime is 1031513503. The next prime is 1031513531. The reversal of 1031513521 is 1253151301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872375296 + 159138225 = 29536^2 + 12615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031513521 - 2⁹ = 1031513009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1031513492 and 1031513501.

It is not a weakly prime, because it can be changed into another prime (1031513501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515756760 + 515756761.

It is an arithmetic number, because the mean of its divisors is an integer number (515756761).

Almost surely, 2^1031513521 is an apocalyptic number.

It is an amenable number.

1031513521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031513521 is an equidigital number, since it uses as much as digits as its factorization.

1031513521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1031513521 is about 32117.1842009850. The cubic root of 1031513521 is about 1010.3960545223.

Adding to 1031513521 its reverse (1253151301), we get a palindrome (2284664822).

The spelling of 1031513521 in words is "one billion, thirty-one million, five hundred thirteen thousand, five hundred twenty-one".