538039921 has 2 divisors, whose sum is σ = 538039922. Its totient is φ = 538039920.

The previous prime is 538039889. The next prime is 538039969. The reversal of 538039921 is 129930835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433264225 + 104775696 = 20815^2 + 10236^2 .

It is a cyclic number.

It is not a de Polignac number, because 538039921 - 2⁵ = 538039889 is a prime.

It is not a weakly prime, because it can be changed into another prime (538039981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269019960 + 269019961.

It is an arithmetic number, because the mean of its divisors is an integer number (269019961).

Almost surely, 2^538039921 is an apocalyptic number.

It is an amenable number.

538039921 is a deficient number, since it is larger than the sum of its proper divisors (1).

538039921 is an equidigital number, since it uses as much as digits as its factorization.

538039921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 538039921 is about 23195.6875517843. The cubic root of 538039921 is about 813.3388176905.

The spelling of 538039921 in words is "five hundred thirty-eight million, thirty-nine thousand, nine hundred twenty-one".