538021889 has 2 divisors, whose sum is σ = 538021890. Its totient is φ = 538021888.

The previous prime is 538021877. The next prime is 538021927. The reversal of 538021889 is 988120835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339775489 + 198246400 = 18433^2 + 14080^2 .

It is a cyclic number.

It is not a de Polignac number, because 538021889 - 2²⁰ = 536973313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_28249991 and since 538021889 and 28249991 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (538026889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269010944 + 269010945.

It is an arithmetic number, because the mean of its divisors is an integer number (269010945).

Almost surely, 2^538021889 is an apocalyptic number.

It is an amenable number.

538021889 is a deficient number, since it is larger than the sum of its proper divisors (1).

538021889 is an equidigital number, since it uses as much as digits as its factorization.

538021889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 538021889 is about 23195.2988555871. The cubic root of 538021889 is about 813.3297314444.

The spelling of 538021889 in words is "five hundred thirty-eight million, twenty-one thousand, eight hundred eighty-nine".