139432289 has 2 divisors, whose sum is σ = 139432290. Its totient is φ = 139432288.

The previous prime is 139432277. The next prime is 139432297. The reversal of 139432289 is 982234931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129572689 + 9859600 = 11383^2 + 3140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139432289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139432219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69716144 + 69716145.

It is an arithmetic number, because the mean of its divisors is an integer number (69716145).

Almost surely, 2^139432289 is an apocalyptic number.

It is an amenable number.

139432289 is a deficient number, since it is larger than the sum of its proper divisors (1).

139432289 is an equidigital number, since it uses as much as digits as its factorization.

139432289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 139432289 is about 11808.1450279034. The cubic root of 139432289 is about 518.5465936163.

The spelling of 139432289 in words is "one hundred thirty-nine million, four hundred thirty-two thousand, two hundred eighty-nine".