621343231 has 4 divisors (see below), whose sum is σ = 621542592. Its totient is φ = 621143872.

The previous prime is 621343171. The next prime is 621343253. The reversal of 621343231 is 132343126.

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

It is a cyclic number.

It is not a de Polignac number, because 621343231 - 2¹⁷ = 621212159 is a prime.

It is a super-2 number, since 2×621343231² = 772134821419038722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621343196 and 621343205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621343271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94930 + ... + 101263.

It is an arithmetic number, because the mean of its divisors is an integer number (155385648).

Almost surely, 2^621343231 is an apocalyptic number.

621343231 is a deficient number, since it is larger than the sum of its proper divisors (199361).

621343231 is a wasteful number, since it uses less digits than its factorization.

621343231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199360.

The product of its digits is 2592, while the sum is 25.

The square root of 621343231 is about 24926.7573302265. The cubic root of 621343231 is about 853.3172475029.

Adding to 621343231 its reverse (132343126), we get a palindrome (753686357).

The spelling of 621343231 in words is "six hundred twenty-one million, three hundred forty-three thousand, two hundred thirty-one".