538356991 has 2 divisors, whose sum is σ = 538356992. Its totient is φ = 538356990.

The previous prime is 538356983. The next prime is 538357009. The reversal of 538356991 is 199653835.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 538356991 - 2³ = 538356983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538356961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269178495 + 269178496.

It is an arithmetic number, because the mean of its divisors is an integer number (269178496).

Almost surely, 2^538356991 is an apocalyptic number.

538356991 is a deficient number, since it is larger than the sum of its proper divisors (1).

538356991 is an equidigital number, since it uses as much as digits as its factorization.

538356991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 49.

The square root of 538356991 is about 23202.5212207639. The cubic root of 538356991 is about 813.4985547209.

The spelling of 538356991 in words is "five hundred thirty-eight million, three hundred fifty-six thousand, nine hundred ninety-one".