1355621 has 4 divisors (see below), whose sum is σ = 1384512. Its totient is φ = 1326732.

The previous prime is 1355609. The next prime is 1355623. The reversal of 1355621 is 1265531.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355623) 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, 14375 + ... + 14468.

It is an arithmetic number, because the mean of its divisors is an integer number (346128).

2^1355621 is an apocalyptic number.

It is an amenable number.

1355621 is a deficient number, since it is larger than the sum of its proper divisors (28891).

1355621 is an equidigital number, since it uses as much as digits as its factorization.

1355621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28890.

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

The square root of 1355621 is about 1164.3113844672. The cubic root of 1355621 is about 110.6741247131.

The spelling of 1355621 in words is "one million, three hundred fifty-five thousand, six hundred twenty-one".