216354613 has 2 divisors, whose sum is σ = 216354614. Its totient is φ = 216354612.

The previous prime is 216354601. The next prime is 216354623. The reversal of 216354613 is 316453612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199854769 + 16499844 = 14137^2 + 4062^2 .

It is a cyclic number.

It is not a de Polignac number, because 216354613 - 2¹³ = 216346421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216354623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108177306 + 108177307.

It is an arithmetic number, because the mean of its divisors is an integer number (108177307).

Almost surely, 2^216354613 is an apocalyptic number.

It is an amenable number.

216354613 is a deficient number, since it is larger than the sum of its proper divisors (1).

216354613 is an equidigital number, since it uses as much as digits as its factorization.

216354613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 216354613 is about 14708.9976884899. The cubic root of 216354613 is about 600.3281658496.

The spelling of 216354613 in words is "two hundred sixteen million, three hundred fifty-four thousand, six hundred thirteen".