139605497 has 2 divisors, whose sum is σ = 139605498. Its totient is φ = 139605496.

The previous prime is 139605491. The next prime is 139605509. The reversal of 139605497 is 794506931.

139605497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130051216 + 9554281 = 11404^2 + 3091^2 .

It is a cyclic number.

It is not a de Polignac number, because 139605497 - 2²⁰ = 138556921 is a prime.

It is not a weakly prime, because it can be changed into another prime (139605491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69802748 + 69802749.

It is an arithmetic number, because the mean of its divisors is an integer number (69802749).

Almost surely, 2^139605497 is an apocalyptic number.

It is an amenable number.

139605497 is a deficient number, since it is larger than the sum of its proper divisors (1).

139605497 is an equidigital number, since it uses as much as digits as its factorization.

139605497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 139605497 is about 11815.4770111071. The cubic root of 139605497 is about 518.7612240858.

The spelling of 139605497 in words is "one hundred thirty-nine million, six hundred five thousand, four hundred ninety-seven".