621991373 has 8 divisors (see below), whose sum is σ = 635627520. Its totient is φ = 608372080.

The previous prime is 621991343. The next prime is 621991379. The reversal of 621991373 is 373199126.

621991373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 621991373 - 2¹⁰ = 621990349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621991373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621991379) 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, 96083 + ... + 102351.

It is an arithmetic number, because the mean of its divisors is an integer number (79453440).

Almost surely, 2^621991373 is an apocalyptic number.

It is an amenable number.

621991373 is a deficient number, since it is larger than the sum of its proper divisors (13636147).

621991373 is a wasteful number, since it uses less digits than its factorization.

621991373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8427.

The product of its digits is 61236, while the sum is 41.

The square root of 621991373 is about 24939.7548704874. The cubic root of 621991373 is about 853.6138514425.

The spelling of 621991373 in words is "six hundred twenty-one million, nine hundred ninety-one thousand, three hundred seventy-three".