1523521 has 2 divisors, whose sum is σ = 1523522. Its totient is φ = 1523520.

The previous prime is 1523507. The next prime is 1523527. The reversal of 1523521 is 1253251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 83521 = 1200^2 + 289^2 .

It is an emirp because it is prime and its reverse (1253251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1523521 - 2⁷ = 1523393 is a prime.

It is a super-2 number, since 2×1523521² = 4642232474882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1523527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761760 + 761761.

It is an arithmetic number, because the mean of its divisors is an integer number (761761).

2^1523521 is an apocalyptic number.

It is an amenable number.

1523521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523521 is an equidigital number, since it uses as much as digits as its factorization.

1523521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 19.

The square root of 1523521 is about 1234.3099286646. The cubic root of 1523521 is about 115.0666532322.

Adding to 1523521 its reverse (1253251), we get a palindrome (2776772).

The spelling of 1523521 in words is "one million, five hundred twenty-three thousand, five hundred twenty-one".