999506213 has 2 divisors, whose sum is σ = 999506214. Its totient is φ = 999506212.

The previous prime is 999506173. The next prime is 999506227. The reversal of 999506213 is 312605999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680062084 + 319444129 = 26078^2 + 17873^2 .

It is a cyclic number.

It is not a de Polignac number, because 999506213 - 2¹² = 999502117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999506243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499753106 + 499753107.

It is an arithmetic number, because the mean of its divisors is an integer number (499753107).

Almost surely, 2^999506213 is an apocalyptic number.

It is an amenable number.

999506213 is a deficient number, since it is larger than the sum of its proper divisors (1).

999506213 is an equidigital number, since it uses as much as digits as its factorization.

999506213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 999506213 is about 31614.9681796455. The cubic root of 999506213 is about 999.8353772342.

The spelling of 999506213 in words is "nine hundred ninety-nine million, five hundred six thousand, two hundred thirteen".