139173569 has 2 divisors, whose sum is σ = 139173570. Its totient is φ = 139173568.

The previous prime is 139173521. The next prime is 139173571. The reversal of 139173569 is 965371931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 68277169 = 8420^2 + 8263^2 .

It is a cyclic number.

It is not a de Polignac number, because 139173569 - 2⁸ = 139173313 is a prime.

It is a super-2 number, since 2×139173569² = 38738564616395522, which contains 22 as substring.

Together with 139173571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139173469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69586784 + 69586785.

It is an arithmetic number, because the mean of its divisors is an integer number (69586785).

Almost surely, 2^139173569 is an apocalyptic number.

It is an amenable number.

139173569 is a deficient number, since it is larger than the sum of its proper divisors (1).

139173569 is an equidigital number, since it uses as much as digits as its factorization.

139173569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 44.

The square root of 139173569 is about 11797.1847912966. The cubic root of 139173569 is about 518.2256697726.

The spelling of 139173569 in words is "one hundred thirty-nine million, one hundred seventy-three thousand, five hundred sixty-nine".