139496897 has 4 divisors (see below), whose sum is σ = 139696596. Its totient is φ = 139297200.

The previous prime is 139496887. The next prime is 139496899. The reversal of 139496897 is 798694931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798694931 = 10273 ⋅77747.

It can be written as a sum of positive squares in 2 ways, for example, as 133425601 + 6071296 = 11551^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 139496897 - 2¹⁶ = 139431361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139496899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98798 + ... + 100199.

It is an arithmetic number, because the mean of its divisors is an integer number (34924149).

Almost surely, 2^139496897 is an apocalyptic number.

It is an amenable number.

139496897 is a deficient number, since it is larger than the sum of its proper divisors (199699).

139496897 is an equidigital number, since it uses as much as digits as its factorization.

139496897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199698.

The product of its digits is 2939328, while the sum is 56.

The square root of 139496897 is about 11810.8804498225. The cubic root of 139496897 is about 518.6266733102.

The spelling of 139496897 in words is "one hundred thirty-nine million, four hundred ninety-six thousand, eight hundred ninety-seven".