538633391 has 2 divisors, whose sum is σ = 538633392. Its totient is φ = 538633390.

The previous prime is 538633369. The next prime is 538633409. The reversal of 538633391 is 193336835.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 538633391 - 2¹⁸ = 538371247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538633331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269316695 + 269316696.

It is an arithmetic number, because the mean of its divisors is an integer number (269316696).

Almost surely, 2^538633391 is an apocalyptic number.

538633391 is a deficient number, since it is larger than the sum of its proper divisors (1).

538633391 is an equidigital number, since it uses as much as digits as its factorization.

538633391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 41.

The square root of 538633391 is about 23208.4767057211. The cubic root of 538633391 is about 813.6377514093.

The spelling of 538633391 in words is "five hundred thirty-eight million, six hundred thirty-three thousand, three hundred ninety-one".