538618891 has 2 divisors, whose sum is σ = 538618892. Its totient is φ = 538618890.

The previous prime is 538618889. The next prime is 538618937. The reversal of 538618891 is 198816835.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 538618891 - 2¹ = 538618889 is a prime.

It is a super-2 number, since 2×538618891² = 580220619484139762, which contains 22 as substring.

Together with 538618889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (538618391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269309445 + 269309446.

It is an arithmetic number, because the mean of its divisors is an integer number (269309446).

Almost surely, 2^538618891 is an apocalyptic number.

538618891 is a deficient number, since it is larger than the sum of its proper divisors (1).

538618891 is an equidigital number, since it uses as much as digits as its factorization.

538618891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 49.

The square root of 538618891 is about 23208.1643177568. The cubic root of 538618891 is about 813.6304503065.

The spelling of 538618891 in words is "five hundred thirty-eight million, six hundred eighteen thousand, eight hundred ninety-one".