516306421 has 4 divisors (see below), whose sum is σ = 527291712. Its totient is φ = 505321132.

The previous prime is 516306419. The next prime is 516306431. The reversal of 516306421 is 124603615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 516306421 - 2¹ = 516306419 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 516306421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516306431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5492575 + ... + 5492668.

It is an arithmetic number, because the mean of its divisors is an integer number (131822928).

Almost surely, 2^516306421 is an apocalyptic number.

It is an amenable number.

516306421 is a deficient number, since it is larger than the sum of its proper divisors (10985291).

516306421 is a wasteful number, since it uses less digits than its factorization.

516306421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985290.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 516306421 is about 22722.3770983583. The cubic root of 516306421 is about 802.2366684194.

The spelling of 516306421 in words is "five hundred sixteen million, three hundred six thousand, four hundred twenty-one".