139117889 has 2 divisors, whose sum is σ = 139117890. Its totient is φ = 139117888.

The previous prime is 139117871. The next prime is 139117907. The reversal of 139117889 is 988711931.

It is a balanced prime because it is at equal distance from previous prime (139117871) and next prime (139117907).

It can be written as a sum of positive squares in only one way, i.e., 88209664 + 50908225 = 9392^2 + 7135^2 .

It is an emirp because it is prime and its reverse (988711931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139117889 is a prime.

It is not a weakly prime, because it can be changed into another prime (139117819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69558944 + 69558945.

It is an arithmetic number, because the mean of its divisors is an integer number (69558945).

Almost surely, 2^139117889 is an apocalyptic number.

It is an amenable number.

139117889 is a deficient number, since it is larger than the sum of its proper divisors (1).

139117889 is an equidigital number, since it uses as much as digits as its factorization.

139117889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 47.

The square root of 139117889 is about 11794.8246701678. The cubic root of 139117889 is about 518.1565506757.

The spelling of 139117889 in words is "one hundred thirty-nine million, one hundred seventeen thousand, eight hundred eighty-nine".