1521085 has 4 divisors (see below), whose sum is σ = 1825308. Its totient is φ = 1216864.

The previous prime is 1521067. The next prime is 1521089. The reversal of 1521085 is 5801251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5801251 = 19 ⋅305329.

It can be written as a sum of positive squares in 2 ways, for example, as 994009 + 527076 = 997^2 + 726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521085 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1521085 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152104 + ... + 152113.

It is an arithmetic number, because the mean of its divisors is an integer number (456327).

2^1521085 is an apocalyptic number.

It is an amenable number.

1521085 is a deficient number, since it is larger than the sum of its proper divisors (304223).

1521085 is an equidigital number, since it uses as much as digits as its factorization.

1521085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304222.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1521085 is about 1233.3227477023. The cubic root of 1521085 is about 115.0052927621.

The spelling of 1521085 in words is "one million, five hundred twenty-one thousand, eighty-five".