438216491 has 2 divisors, whose sum is σ = 438216492. Its totient is φ = 438216490.

The previous prime is 438216479. The next prime is 438216521. The reversal of 438216491 is 194612834.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438216491 - 2¹⁴ = 438200107 is a prime.

It is not a weakly prime, because it can be changed into another prime (438216431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219108245 + 219108246.

It is an arithmetic number, because the mean of its divisors is an integer number (219108246).

Almost surely, 2^438216491 is an apocalyptic number.

438216491 is a deficient number, since it is larger than the sum of its proper divisors (1).

438216491 is an equidigital number, since it uses as much as digits as its factorization.

438216491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 438216491 is about 20933.6210675554. The cubic root of 438216491 is about 759.5614338346.

The spelling of 438216491 in words is "four hundred thirty-eight million, two hundred sixteen thousand, four hundred ninety-one".