139691593 has 2 divisors, whose sum is σ = 139691594. Its totient is φ = 139691592.

The previous prime is 139691569. The next prime is 139691621. The reversal of 139691593 is 395196931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133356304 + 6335289 = 11548^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 139691593 - 2⁵ = 139691561 is a prime.

It is not a weakly prime, because it can be changed into another prime (139601593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69845796 + 69845797.

It is an arithmetic number, because the mean of its divisors is an integer number (69845797).

Almost surely, 2^139691593 is an apocalyptic number.

It is an amenable number.

139691593 is a deficient number, since it is larger than the sum of its proper divisors (1).

139691593 is an equidigital number, since it uses as much as digits as its factorization.

139691593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 46.

The square root of 139691593 is about 11819.1198064831. The cubic root of 139691593 is about 518.8678437845.

The spelling of 139691593 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, five hundred ninety-three".