1521545 has 8 divisors (see below), whose sum is σ = 1842696. Its totient is φ = 1206016.

The previous prime is 1521497. The next prime is 1521547. The reversal of 1521545 is 5451251.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3721 + 1517824 = 61^2 + 1232^2 .

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 1521545 - 2¹² = 1517449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1521545.

It is not an unprimeable number, because it can be changed into a prime (1521547) 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, 782 + ... + 1911.

It is an arithmetic number, because the mean of its divisors is an integer number (230337).

2^1521545 is an apocalyptic number.

It is an amenable number.

1521545 is a deficient number, since it is larger than the sum of its proper divisors (321151).

1521545 is a wasteful number, since it uses less digits than its factorization.

1521545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811.

The product of its digits is 1000, while the sum is 23.

The square root of 1521545 is about 1233.5092216923. The cubic root of 1521545 is about 115.0168847294.

Adding to 1521545 its reverse (5451251), we get a palindrome (6972796).

The spelling of 1521545 in words is "one million, five hundred twenty-one thousand, five hundred forty-five".