621231 has 16 divisors (see below), whose sum is σ = 945504. Its totient is φ = 359424.

The previous prime is 621227. The next prime is 621239. The reversal of 621231 is 132126.

It is not a de Polignac number, because 621231 - 2² = 621227 is a prime.

It is a super-2 number, since 2×621231² = 771855910722, which contains 22 as substring.

621231 is a lucky number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 621231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 1131.

It is an arithmetic number, because the mean of its divisors is an integer number (59094).

2⁶²¹²³¹ is an apocalyptic number.

621231 is a deficient number, since it is larger than the sum of its proper divisors (324273).

621231 is a wasteful number, since it uses less digits than its factorization.

621231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its digits is 72, while the sum is 15.

The square root of 621231 is about 788.1820855615. The cubic root of 621231 is about 85.3265867198.

Adding to 621231 its reverse (132126), we get a palindrome (753357).

The spelling of 621231 in words is "six hundred twenty-one thousand, two hundred thirty-one".