621643343 has 8 divisors (see below), whose sum is σ = 624429312. Its totient is φ = 618863616.

The previous prime is 621643331. The next prime is 621643361. The reversal of 621643343 is 343346126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621643343 - 2¹⁴ = 621626959 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 (621643313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365471 + ... + 367167.

It is an arithmetic number, because the mean of its divisors is an integer number (78053664).

Almost surely, 2^621643343 is an apocalyptic number.

621643343 is a deficient number, since it is larger than the sum of its proper divisors (2785969).

621643343 is a wasteful number, since it uses less digits than its factorization.

621643343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121.

The product of its digits is 31104, while the sum is 32.

The square root of 621643343 is about 24932.7764799671. The cubic root of 621643343 is about 853.4546109402.

Adding to 621643343 its reverse (343346126), we get a palindrome (964989469).

The spelling of 621643343 in words is "six hundred twenty-one million, six hundred forty-three thousand, three hundred forty-three".