139088689 has 2 divisors, whose sum is σ = 139088690. Its totient is φ = 139088688.

The previous prime is 139088641. The next prime is 139088699. The reversal of 139088689 is 986880931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 16875664 = 11055^2 + 4108^2 .

It is an emirp because it is prime and its reverse (986880931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139088689 - 2¹³ = 139080497 is a prime.

It is not a weakly prime, because it can be changed into another prime (139088629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69544344 + 69544345.

It is an arithmetic number, because the mean of its divisors is an integer number (69544345).

Almost surely, 2^139088689 is an apocalyptic number.

It is an amenable number.

139088689 is a deficient number, since it is larger than the sum of its proper divisors (1).

139088689 is an equidigital number, since it uses as much as digits as its factorization.

139088689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 139088689 is about 11793.5867741752. The cubic root of 139088689 is about 518.1202955014.

The spelling of 139088689 in words is "one hundred thirty-nine million, eighty-eight thousand, six hundred eighty-nine".