621351673 has 4 divisors (see below), whose sum is σ = 631537828. Its totient is φ = 611165520.

The previous prime is 621351671. The next prime is 621351707. The reversal of 621351673 is 376153126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 238640704 + 382710969 = 15448^2 + 19563^2 .

It is a cyclic number.

It is not a de Polignac number, because 621351673 - 2¹ = 621351671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621351671) 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 3 ways as a sum of consecutive naturals, for example, 5092986 + ... + 5093107.

It is an arithmetic number, because the mean of its divisors is an integer number (157884457).

Almost surely, 2^621351673 is an apocalyptic number.

It is an amenable number.

621351673 is a deficient number, since it is larger than the sum of its proper divisors (10186155).

621351673 is a wasteful number, since it uses less digits than its factorization.

621351673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186154.

The product of its digits is 22680, while the sum is 34.

The square root of 621351673 is about 24926.9266657565. The cubic root of 621351673 is about 853.3211120720.

The spelling of 621351673 in words is "six hundred twenty-one million, three hundred fifty-one thousand, six hundred seventy-three".