138291371 has 2 divisors, whose sum is σ = 138291372. Its totient is φ = 138291370.

The previous prime is 138291323. The next prime is 138291383. The reversal of 138291371 is 173192831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138291371 is a prime.

It is a Chen prime.

It is equal to p_7820918 and since 138291371 and 7820918 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138291301) 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 as a sum of consecutive naturals, namely, 69145685 + 69145686.

It is an arithmetic number, because the mean of its divisors is an integer number (69145686).

Almost surely, 2^138291371 is an apocalyptic number.

138291371 is a deficient number, since it is larger than the sum of its proper divisors (1).

138291371 is an equidigital number, since it uses as much as digits as its factorization.

138291371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 138291371 is about 11759.7351585824. The cubic root of 138291371 is about 517.1283659769.

The spelling of 138291371 in words is "one hundred thirty-eight million, two hundred ninety-one thousand, three hundred seventy-one".