138169771 has 4 divisors (see below), whose sum is σ = 138415752. Its totient is φ = 137923792.

The previous prime is 138169747. The next prime is 138169831. The reversal of 138169771 is 177961831.

It is a happy number.

138169771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138169771 - 2⁵ = 138169739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138169711) 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, 122146 + ... + 123271.

It is an arithmetic number, because the mean of its divisors is an integer number (34603938).

Almost surely, 2^138169771 is an apocalyptic number.

138169771 is a deficient number, since it is larger than the sum of its proper divisors (245981).

138169771 is an equidigital number, since it uses as much as digits as its factorization.

138169771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245980.

The product of its digits is 63504, while the sum is 43.

The square root of 138169771 is about 11754.5638370805. The cubic root of 138169771 is about 516.9767507101.

The spelling of 138169771 in words is "one hundred thirty-eight million, one hundred sixty-nine thousand, seven hundred seventy-one".