621331 has 4 divisors (see below), whose sum is σ = 623392. Its totient is φ = 619272.

The previous prime is 621317. The next prime is 621337. The reversal of 621331 is 133126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621331 is a prime.

It is a super-2 number, since 2×621331² = 772104423122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621337) 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, 480 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (155848).

2⁶²¹³³¹ is an apocalyptic number.

621331 is a deficient number, since it is larger than the sum of its proper divisors (2061).

621331 is a wasteful number, since it uses less digits than its factorization.

621331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060.

The product of its digits is 108, while the sum is 16.

The square root of 621331 is about 788.2455201268. The cubic root of 621331 is about 85.3311648348.

Adding to 621331 its reverse (133126), we get a palindrome (754457).

The spelling of 621331 in words is "six hundred twenty-one thousand, three hundred thirty-one".