1521313 has 8 divisors (see below), whose sum is σ = 1627560. Its totient is φ = 1416960.

The previous prime is 1521301. The next prime is 1521323. The reversal of 1521313 is 3131251.

It can be written as a sum of positive squares in 4 ways, for example, as 380689 + 1140624 = 617^2 + 1068^2 .

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 1521313 - 2⁵ = 1521281 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (203445).

2^1521313 is an apocalyptic number.

It is an amenable number.

1521313 is a deficient number, since it is larger than the sum of its proper divisors (106247).

1521313 is a wasteful number, since it uses less digits than its factorization.

1521313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its digits is 90, while the sum is 16.

The square root of 1521313 is about 1233.4151774646. The cubic root of 1521313 is about 115.0110386379.

Adding to 1521313 its reverse (3131251), we get a palindrome (4652564).

The spelling of 1521313 in words is "one million, five hundred twenty-one thousand, three hundred thirteen".