138808613 has 2 divisors, whose sum is σ = 138808614. Its totient is φ = 138808612.

The previous prime is 138808577. The next prime is 138808633. The reversal of 138808613 is 316808831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83484769 + 55323844 = 9137^2 + 7438^2 .

It is a cyclic number.

It is not a de Polignac number, because 138808613 - 2²² = 134614309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138808633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69404306 + 69404307.

It is an arithmetic number, because the mean of its divisors is an integer number (69404307).

Almost surely, 2^138808613 is an apocalyptic number.

It is an amenable number.

138808613 is a deficient number, since it is larger than the sum of its proper divisors (1).

138808613 is an equidigital number, since it uses as much as digits as its factorization.

138808613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 138808613 is about 11781.7067099805. The cubic root of 138808613 is about 517.7722907562.

The spelling of 138808613 in words is "one hundred thirty-eight million, eight hundred eight thousand, six hundred thirteen".