139216897 has 4 divisors (see below), whose sum is σ = 139323136. Its totient is φ = 139110660.

The previous prime is 139216873. The next prime is 139216919. The reversal of 139216897 is 798612931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139216897 - 2¹¹ = 139214849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139216807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51129 + ... + 53782.

It is an arithmetic number, because the mean of its divisors is an integer number (34830784).

Almost surely, 2^139216897 is an apocalyptic number.

It is an amenable number.

139216897 is a deficient number, since it is larger than the sum of its proper divisors (106239).

139216897 is a wasteful number, since it uses less digits than its factorization.

139216897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106238.

The product of its digits is 163296, while the sum is 46.

The square root of 139216897 is about 11799.0210187117. The cubic root of 139216897 is about 518.2794427992.

The spelling of 139216897 in words is "one hundred thirty-nine million, two hundred sixteen thousand, eight hundred ninety-seven".