138505011 has 32 divisors (see below), whose sum is σ = 199245312. Its totient is φ = 85367040.

The previous prime is 138504983. The next prime is 138505109. The reversal of 138505011 is 110505831.

It is not a de Polignac number, because 138505011 - 2⁵ = 138504979 is a prime.

It is a super-2 number, since 2×138505011² = 38367276144220242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138505111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489276 + ... + 489558.

It is an arithmetic number, because the mean of its divisors is an integer number (6226416).

Almost surely, 2^138505011 is an apocalyptic number.

138505011 is a deficient number, since it is larger than the sum of its proper divisors (60740301).

138505011 is a wasteful number, since it uses less digits than its factorization.

138505011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 138505011 is about 11768.8151910037. The cubic root of 138505011 is about 517.3945249344.

The spelling of 138505011 in words is "one hundred thirty-eight million, five hundred five thousand, eleven".