621821479 has 4 divisors (see below), whose sum is σ = 630579600. Its totient is φ = 613063360.

The previous prime is 621821443. The next prime is 621821483. The reversal of 621821479 is 974128126.

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 621821479 - 2⁷ = 621821351 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 (621821419) 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, 4378954 + ... + 4379095.

It is an arithmetic number, because the mean of its divisors is an integer number (157644900).

Almost surely, 2^621821479 is an apocalyptic number.

621821479 is a deficient number, since it is larger than the sum of its proper divisors (8758121).

621821479 is an equidigital number, since it uses as much as digits as its factorization.

621821479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8758120.

The product of its digits is 48384, while the sum is 40.

The square root of 621821479 is about 24936.3485498579. The cubic root of 621821479 is about 853.5361241705.

The spelling of 621821479 in words is "six hundred twenty-one million, eight hundred twenty-one thousand, four hundred seventy-nine".