516207421 has 2 divisors, whose sum is σ = 516207422. Its totient is φ = 516207420.

The previous prime is 516207413. The next prime is 516207467. The reversal of 516207421 is 124702615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515971225 + 236196 = 22715^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 516207421 - 2³ = 516207413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516207421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516207401) 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 as a sum of consecutive naturals, namely, 258103710 + 258103711.

It is an arithmetic number, because the mean of its divisors is an integer number (258103711).

Almost surely, 2^516207421 is an apocalyptic number.

It is an amenable number.

516207421 is a deficient number, since it is larger than the sum of its proper divisors (1).

516207421 is an equidigital number, since it uses as much as digits as its factorization.

516207421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 516207421 is about 22720.1985246608. The cubic root of 516207421 is about 802.1853897576.

The spelling of 516207421 in words is "five hundred sixteen million, two hundred seven thousand, four hundred twenty-one".