138359791 has 2 divisors, whose sum is σ = 138359792. Its totient is φ = 138359790.

The previous prime is 138359737. The next prime is 138359803. The reversal of 138359791 is 197953831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138359791 - 2⁹ = 138359279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138353791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69179895 + 69179896.

It is an arithmetic number, because the mean of its divisors is an integer number (69179896).

Almost surely, 2^138359791 is an apocalyptic number.

138359791 is a deficient number, since it is larger than the sum of its proper divisors (1).

138359791 is an equidigital number, since it uses as much as digits as its factorization.

138359791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 138359791 is about 11762.6438779723. The cubic root of 138359791 is about 517.2136354314.

The spelling of 138359791 in words is "one hundred thirty-eight million, three hundred fifty-nine thousand, seven hundred ninety-one".