1531521 has 16 divisors (see below), whose sum is σ = 2291520. Its totient is φ = 1010880.

The previous prime is 1531499. The next prime is 1531549. The reversal of 1531521 is 1251351.

It is not a de Polignac number, because 1531521 - 2¹³ = 1523329 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1531494 and 1531503.

It is not an unprimeable number, because it can be changed into a prime (1531561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321 + ... + 3753.

It is an arithmetic number, because the mean of its divisors is an integer number (143220).

2^1531521 is an apocalyptic number.

It is an amenable number.

1531521 is a deficient number, since it is larger than the sum of its proper divisors (759999).

1531521 is a wasteful number, since it uses less digits than its factorization.

1531521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 567 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 1531521 is about 1237.5463627679. The cubic root of 1531521 is about 115.2677065098.

Adding to 1531521 its reverse (1251351), we get a palindrome (2782872).

The spelling of 1531521 in words is "one million, five hundred thirty-one thousand, five hundred twenty-one".