306516421 has 4 divisors (see below), whose sum is σ = 306633100. Its totient is φ = 306399744.

The previous prime is 306516407. The next prime is 306516433. The reversal of 306516421 is 124615603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124615603 = 7 ⋅17802229.

It can be written as a sum of positive squares in 2 ways, for example, as 144336196 + 162180225 = 12014^2 + 12735^2 .

It is a cyclic number.

It is not a de Polignac number, because 306516421 - 2⁵ = 306516389 is a prime.

It is a pancake number, because a pancake can be divided into 306516421 parts by 24759 straight cuts.

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 306516421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306516401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54306 + ... + 59683.

It is an arithmetic number, because the mean of its divisors is an integer number (76658275).

Almost surely, 2^306516421 is an apocalyptic number.

It is an amenable number.

306516421 is a deficient number, since it is larger than the sum of its proper divisors (116679).

306516421 is a wasteful number, since it uses less digits than its factorization.

306516421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116678.

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

The square root of 306516421 is about 17507.6103737775. The cubic root of 306516421 is about 674.2452806491.

The spelling of 306516421 in words is "three hundred six million, five hundred sixteen thousand, four hundred twenty-one".