139866061 has 2 divisors, whose sum is σ = 139866062. Its totient is φ = 139866060.

The previous prime is 139865983. The next prime is 139866071. The reversal of 139866061 is 160668931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103938025 + 35928036 = 10195^2 + 5994^2 .

It is an emirp because it is prime and its reverse (160668931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139866061 - 2⁷ = 139865933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139866071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69933030 + 69933031.

It is an arithmetic number, because the mean of its divisors is an integer number (69933031).

Almost surely, 2^139866061 is an apocalyptic number.

It is an amenable number.

139866061 is a deficient number, since it is larger than the sum of its proper divisors (1).

139866061 is an equidigital number, since it uses as much as digits as its factorization.

139866061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 139866061 is about 11826.4982560350. The cubic root of 139866061 is about 519.0837674768.

The spelling of 139866061 in words is "one hundred thirty-nine million, eight hundred sixty-six thousand, sixty-one".