139318493 has 2 divisors, whose sum is σ = 139318494. Its totient is φ = 139318492.

The previous prime is 139318463. The next prime is 139318499. The reversal of 139318493 is 394813931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112826884 + 26491609 = 10622^2 + 5147^2 .

It is an emirp because it is prime and its reverse (394813931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139318493 - 2¹² = 139314397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139318493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139318499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69659246 + 69659247.

It is an arithmetic number, because the mean of its divisors is an integer number (69659247).

Almost surely, 2^139318493 is an apocalyptic number.

It is an amenable number.

139318493 is a deficient number, since it is larger than the sum of its proper divisors (1).

139318493 is an equidigital number, since it uses as much as digits as its factorization.

139318493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 139318493 is about 11803.3255059750. The cubic root of 139318493 is about 518.4054866822.

The spelling of 139318493 in words is "one hundred thirty-nine million, three hundred eighteen thousand, four hundred ninety-three".