139305217 has 2 divisors, whose sum is σ = 139305218. Its totient is φ = 139305216.

The previous prime is 139305197. The next prime is 139305233. The reversal of 139305217 is 712503931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139263601 + 41616 = 11801^2 + 204^2 .

It is a cyclic number.

It is not a de Polignac number, because 139305217 - 2¹¹ = 139303169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139305247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69652608 + 69652609.

It is an arithmetic number, because the mean of its divisors is an integer number (69652609).

Almost surely, 2^139305217 is an apocalyptic number.

It is an amenable number.

139305217 is a deficient number, since it is larger than the sum of its proper divisors (1).

139305217 is an equidigital number, since it uses as much as digits as its factorization.

139305217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 139305217 is about 11802.7631086962. The cubic root of 139305217 is about 518.3890194501.

The spelling of 139305217 in words is "one hundred thirty-nine million, three hundred five thousand, two hundred seventeen".