138161465 has 32 divisors (see below), whose sum is σ = 191147040. Its totient is φ = 94961664.

The previous prime is 138161461. The next prime is 138161467. The reversal of 138161465 is 564161831.

It can be written as a sum of positive squares in 16 ways, for example, as 17952169 + 120209296 = 4237^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 138161465 - 2² = 138161461 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138161461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106541 + ... + 107829.

It is an arithmetic number, because the mean of its divisors is an integer number (5973345).

Almost surely, 2^138161465 is an apocalyptic number.

It is an amenable number.

138161465 is a deficient number, since it is larger than the sum of its proper divisors (52985575).

138161465 is a wasteful number, since it uses less digits than its factorization.

138161465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 17280, while the sum is 35.

The square root of 138161465 is about 11754.2105221916. The cubic root of 138161465 is about 516.9663912446.

The spelling of 138161465 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, four hundred sixty-five".