355921 has 4 divisors (see below), whose sum is σ = 364644. Its totient is φ = 347200.

The previous prime is 355913. The next prime is 355933. The reversal of 355921 is 129553.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140625 + 215296 = 375^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 355921 - 2³ = 355913 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (355951) 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, 4300 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (91161).

2³⁵⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

355921 is a deficient number, since it is larger than the sum of its proper divisors (8723).

355921 is an equidigital number, since it uses as much as digits as its factorization.

355921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8722.

The product of its digits is 1350, while the sum is 25.

The square root of 355921 is about 596.5911497835. The cubic root of 355921 is about 70.8681677183.

The spelling of 355921 in words is "three hundred fifty-five thousand, nine hundred twenty-one".