544638691 has 2 divisors, whose sum is σ = 544638692. Its totient is φ = 544638690.

The previous prime is 544638671. The next prime is 544638701. The reversal of 544638691 is 196836445.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 544638691 - 2⁹ = 544638179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (544638671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272319345 + 272319346.

It is an arithmetic number, because the mean of its divisors is an integer number (272319346).

Almost surely, 2^544638691 is an apocalyptic number.

544638691 is a deficient number, since it is larger than the sum of its proper divisors (1).

544638691 is an equidigital number, since it uses as much as digits as its factorization.

544638691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 544638691 is about 23337.4953883231. The cubic root of 544638691 is about 816.6503704833.

The spelling of 544638691 in words is "five hundred forty-four million, six hundred thirty-eight thousand, six hundred ninety-one".