138169469 has 2 divisors, whose sum is σ = 138169470. Its totient is φ = 138169468.

The previous prime is 138169459. The next prime is 138169517. The reversal of 138169469 is 964961831.

138169469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124590244 + 13579225 = 11162^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 138169469 - 2²⁴ = 121392253 is a prime.

It is a super-2 number, since 2×138169469² = 38181604327483922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138169459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69084734 + 69084735.

It is an arithmetic number, because the mean of its divisors is an integer number (69084735).

Almost surely, 2^138169469 is an apocalyptic number.

It is an amenable number.

138169469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138169469 is an equidigital number, since it uses as much as digits as its factorization.

138169469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 138169469 is about 11754.5509909992. The cubic root of 138169469 is about 516.9763740549.

The spelling of 138169469 in words is "one hundred thirty-eight million, one hundred sixty-nine thousand, four hundred sixty-nine".