138761511 has 16 divisors (see below), whose sum is σ = 211843584. Its totient is φ = 79143264.

The previous prime is 138761471. The next prime is 138761521. The reversal of 138761511 is 115167831.

It is not a de Polignac number, because 138761511 - 2⁷ = 138761383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138761521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5766 + ... + 17628.

It is an arithmetic number, because the mean of its divisors is an integer number (13240224).

Almost surely, 2^138761511 is an apocalyptic number.

138761511 is a deficient number, since it is larger than the sum of its proper divisors (73082073).

138761511 is a wasteful number, since it uses less digits than its factorization.

138761511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12430.

The product of its digits is 5040, while the sum is 33.

The square root of 138761511 is about 11779.7075939940. The cubic root of 138761511 is about 517.7137188156.

The spelling of 138761511 in words is "one hundred thirty-eight million, seven hundred sixty-one thousand, five hundred eleven".