139916897 has 2 divisors, whose sum is σ = 139916898. Its totient is φ = 139916896.

The previous prime is 139916849. The next prime is 139916899. The reversal of 139916897 is 798619931.

139916897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106172416 + 33744481 = 10304^2 + 5809^2 .

It is a cyclic number.

It is not a de Polignac number, because 139916897 - 2²² = 135722593 is a prime.

It is a super-2 number, since 2×139916897² = 39153476132217218, which contains 22 as substring.

Together with 139916899, 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 (139916899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69958448 + 69958449.

It is an arithmetic number, because the mean of its divisors is an integer number (69958449).

Almost surely, 2^139916897 is an apocalyptic number.

It is an amenable number.

139916897 is a deficient number, since it is larger than the sum of its proper divisors (1).

139916897 is an equidigital number, since it uses as much as digits as its factorization.

139916897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The square root of 139916897 is about 11828.6473022066. The cubic root of 139916897 is about 519.1466489360.

The spelling of 139916897 in words is "one hundred thirty-nine million, nine hundred sixteen thousand, eight hundred ninety-seven".