1356521 has 4 divisors (see below), whose sum is σ = 1388112. Its totient is φ = 1324932.

The previous prime is 1356503. The next prime is 1356539. The reversal of 1356521 is 1256531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1356503) and next prime (1356539).

It is a cyclic number.

It is not a de Polignac number, because 1356521 - 2¹⁸ = 1094377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1356571) 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 3 ways as a sum of consecutive naturals, for example, 15731 + ... + 15816.

It is an arithmetic number, because the mean of its divisors is an integer number (347028).

2^1356521 is an apocalyptic number.

It is an amenable number.

1356521 is a deficient number, since it is larger than the sum of its proper divisors (31591).

1356521 is an equidigital number, since it uses as much as digits as its factorization.

1356521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31590.

The product of its digits is 900, while the sum is 23.

The square root of 1356521 is about 1164.6978148859. The cubic root of 1356521 is about 110.6986115663.

The spelling of 1356521 in words is "one million, three hundred fifty-six thousand, five hundred twenty-one".