138175511 has 2 divisors, whose sum is σ = 138175512. Its totient is φ = 138175510.

The previous prime is 138175489. The next prime is 138175561. The reversal of 138175511 is 115571831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138175511 is a prime.

It is a super-2 number, since 2×138175511² = 38184943680222242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138175561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69087755 + 69087756.

It is an arithmetic number, because the mean of its divisors is an integer number (69087756).

Almost surely, 2^138175511 is an apocalyptic number.

138175511 is a deficient number, since it is larger than the sum of its proper divisors (1).

138175511 is an equidigital number, since it uses as much as digits as its factorization.

138175511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 32.

The square root of 138175511 is about 11754.8079950291. The cubic root of 138175511 is about 516.9839095491.

The spelling of 138175511 in words is "one hundred thirty-eight million, one hundred seventy-five thousand, five hundred eleven".