516423621 has 16 divisors (see below), whose sum is σ = 799833728. Its totient is φ = 290260800.

The previous prime is 516423617. The next prime is 516423631. The reversal of 516423621 is 126324615.

It is not a de Polignac number, because 516423621 - 2² = 516423617 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516423631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200290 + ... + 202851.

It is an arithmetic number, because the mean of its divisors is an integer number (49989608).

Almost surely, 2^516423621 is an apocalyptic number.

It is an amenable number.

516423621 is a deficient number, since it is larger than the sum of its proper divisors (283410107).

516423621 is a wasteful number, since it uses less digits than its factorization.

516423621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403212.

The product of its digits is 8640, while the sum is 30.

The square root of 516423621 is about 22724.9559075480. The cubic root of 516423621 is about 802.2973655948.

The spelling of 516423621 in words is "five hundred sixteen million, four hundred twenty-three thousand, six hundred twenty-one".