1521081 has 6 divisors (see below), whose sum is σ = 2197130. Its totient is φ = 1014048.

The previous prime is 1521067. The next prime is 1521089. The reversal of 1521081 is 1801251.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 275625 = 1116^2 + 525^2 .

It is not a de Polignac number, because 1521081 - 2⁵ = 1521049 is a prime.

It is a super-2 number, since 2×1521081² = 4627374817122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84496 + ... + 84513.

2^1521081 is an apocalyptic number.

It is an amenable number.

1521081 is a deficient number, since it is larger than the sum of its proper divisors (676049).

1521081 is a wasteful number, since it uses less digits than its factorization.

1521081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169015 (or 169012 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1521081 is about 1233.3211260657. The cubic root of 1521081 is about 115.0051919521.

The spelling of 1521081 in words is "one million, five hundred twenty-one thousand, eighty-one".