139515289 has 2 divisors, whose sum is σ = 139515290. Its totient is φ = 139515288.

The previous prime is 139515269. The next prime is 139515293. The reversal of 139515289 is 982515931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137241225 + 2274064 = 11715^2 + 1508^2 .

It is a cyclic number.

It is not a de Polignac number, because 139515289 - 2¹³ = 139507097 is a prime.

It is not a weakly prime, because it can be changed into another prime (139515269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69757644 + 69757645.

It is an arithmetic number, because the mean of its divisors is an integer number (69757645).

Almost surely, 2^139515289 is an apocalyptic number.

It is an amenable number.

139515289 is a deficient number, since it is larger than the sum of its proper divisors (1).

139515289 is an equidigital number, since it uses as much as digits as its factorization.

139515289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 43.

The square root of 139515289 is about 11811.6590282653. The cubic root of 139515289 is about 518.6494651257.

The spelling of 139515289 in words is "one hundred thirty-nine million, five hundred fifteen thousand, two hundred eighty-nine".