1003531521 has 16 divisors (see below), whose sum is σ = 1374050304. Its totient is φ = 651216384.

The previous prime is 1003531519. The next prime is 1003531541. The reversal of 1003531521 is 1251353001.

It is not a de Polignac number, because 1003531521 - 2¹ = 1003531519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1003531541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4656 + ... + 45041.

It is an arithmetic number, because the mean of its divisors is an integer number (85878144).

Almost surely, 2^1003531521 is an apocalyptic number.

It is an amenable number.

1003531521 is a deficient number, since it is larger than the sum of its proper divisors (370518783).

1003531521 is a wasteful number, since it uses less digits than its factorization.

1003531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49880.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1003531521 is about 31678.5656398771. The cubic root of 1003531521 is about 1001.1757906412.

Adding to 1003531521 its reverse (1251353001), we get a palindrome (2254884522).

The spelling of 1003531521 in words is "one billion, three million, five hundred thirty-one thousand, five hundred twenty-one".