1002540521 has 2 divisors, whose sum is σ = 1002540522. Its totient is φ = 1002540520.

The previous prime is 1002540499. The next prime is 1002540559. The reversal of 1002540521 is 1250452001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944947600 + 57592921 = 30740^2 + 7589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002540521 - 2¹⁸ = 1002278377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002540493 and 1002540502.

It is not a weakly prime, because it can be changed into another prime (1002545521) 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, 501270260 + 501270261.

It is an arithmetic number, because the mean of its divisors is an integer number (501270261).

Almost surely, 2^1002540521 is an apocalyptic number.

It is an amenable number.

1002540521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002540521 is an equidigital number, since it uses as much as digits as its factorization.

1002540521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1002540521 is about 31662.9202854064. The cubic root of 1002540521 is about 1000.8461242052.

Adding to 1002540521 its reverse (1250452001), we get a palindrome (2252992522).

The spelling of 1002540521 in words is "one billion, two million, five hundred forty thousand, five hundred twenty-one".