1525531521 has 8 divisors (see below), whose sum is σ = 2035187424. Its totient is φ = 1016448320.

The previous prime is 1525531517. The next prime is 1525531529. The reversal of 1525531521 is 1251355251.

1525531521 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1525531521 - 2² = 1525531517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1525531529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136920 + ... + 147641.

It is an arithmetic number, because the mean of its divisors is an integer number (254398428).

Almost surely, 2^1525531521 is an apocalyptic number.

It is an amenable number.

1525531521 is a deficient number, since it is larger than the sum of its proper divisors (509655903).

1525531521 is a wasteful number, since it uses less digits than its factorization.

1525531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286351.

The product of its digits is 7500, while the sum is 30.

The square root of 1525531521 is about 39058.0532156942. The cubic root of 1525531521 is about 1151.1724705023.

Adding to 1525531521 its reverse (1251355251), we get a palindrome (2776886772).

The spelling of 1525531521 in words is "one billion, five hundred twenty-five million, five hundred thirty-one thousand, five hundred twenty-one".