138027691 has 2 divisors, whose sum is σ = 138027692. Its totient is φ = 138027690.

The previous prime is 138027683. The next prime is 138027713. The reversal of 138027691 is 196720831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138027691 - 2³ = 138027683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138027691.

It is not a weakly prime, because it can be changed into another prime (138027611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69013845 + 69013846.

It is an arithmetic number, because the mean of its divisors is an integer number (69013846).

Almost surely, 2^138027691 is an apocalyptic number.

138027691 is a deficient number, since it is larger than the sum of its proper divisors (1).

138027691 is an equidigital number, since it uses as much as digits as its factorization.

138027691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 138027691 is about 11748.5186725817. The cubic root of 138027691 is about 516.7994875082.

The spelling of 138027691 in words is "one hundred thirty-eight million, twenty-seven thousand, six hundred ninety-one".