624351421 has 4 divisors (see below), whose sum is σ = 626672700. Its totient is φ = 622030144.

The previous prime is 624351391. The next prime is 624351479. The reversal of 624351421 is 124153426.

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 350812900 + 273538521 = 18730^2 + 16539^2 .

It is a cyclic number.

It is not a de Polignac number, because 624351421 - 2⁵ = 624351389 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 624351421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624651421) 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, 1160236 + ... + 1160773.

It is an arithmetic number, because the mean of its divisors is an integer number (156668175).

Almost surely, 2^624351421 is an apocalyptic number.

It is an amenable number.

624351421 is a deficient number, since it is larger than the sum of its proper divisors (2321279).

624351421 is a wasteful number, since it uses less digits than its factorization.

624351421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321278.

The product of its digits is 5760, while the sum is 28.

The square root of 624351421 is about 24987.0250530150. The cubic root of 624351421 is about 854.6921231137.

The spelling of 624351421 in words is "six hundred twenty-four million, three hundred fifty-one thousand, four hundred twenty-one".