538138289 has 4 divisors (see below), whose sum is σ = 579533556. Its totient is φ = 496743024.

The previous prime is 538138277. The next prime is 538138301. The reversal of 538138289 is 982831835.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (538138277) and next prime (538138301).

It can be written as a sum of positive squares in 2 ways, for example, as 191545600 + 346592689 = 13840^2 + 18617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538138289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538138259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20697614 + ... + 20697639.

It is an arithmetic number, because the mean of its divisors is an integer number (144883389).

Almost surely, 2^538138289 is an apocalyptic number.

It is an amenable number.

538138289 is a deficient number, since it is larger than the sum of its proper divisors (41395267).

538138289 is a wasteful number, since it uses less digits than its factorization.

538138289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41395266.

The product of its digits is 414720, while the sum is 47.

The square root of 538138289 is about 23197.8078490188. The cubic root of 538138289 is about 813.3883813222.

The spelling of 538138289 in words is "five hundred thirty-eight million, one hundred thirty-eight thousand, two hundred eighty-nine".