138764161 has 2 divisors, whose sum is σ = 138764162. Its totient is φ = 138764160.

The previous prime is 138764111. The next prime is 138764173. The reversal of 138764161 is 161467831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136890000 + 1874161 = 11700^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 138764161 - 2¹⁵ = 138731393 is a prime.

It is equal to p_7846156 and since 138764161 and 7846156 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138764161.

It is not a weakly prime, because it can be changed into another prime (138764111) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69382080 + 69382081.

It is an arithmetic number, because the mean of its divisors is an integer number (69382081).

Almost surely, 2^138764161 is an apocalyptic number.

It is an amenable number.

138764161 is a deficient number, since it is larger than the sum of its proper divisors (1).

138764161 is an equidigital number, since it uses as much as digits as its factorization.

138764161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 138764161 is about 11779.8200750266. The cubic root of 138764161 is about 517.7170144764.

The spelling of 138764161 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, one hundred sixty-one".