139865361 has 4 divisors (see below), whose sum is σ = 186487152. Its totient is φ = 93243572.

The previous prime is 139865353. The next prime is 139865387. The reversal of 139865361 is 163568931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163568931 = 3 ⋅54522977.

It is a cyclic number.

It is not a de Polignac number, because 139865361 - 2³ = 139865353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139865161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23310891 + ... + 23310896.

It is an arithmetic number, because the mean of its divisors is an integer number (46621788).

Almost surely, 2^139865361 is an apocalyptic number.

It is an amenable number.

139865361 is a deficient number, since it is larger than the sum of its proper divisors (46621791).

139865361 is an equidigital number, since it uses as much as digits as its factorization.

139865361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46621790.

The product of its digits is 116640, while the sum is 42.

The square root of 139865361 is about 11826.4686614391. The cubic root of 139865361 is about 519.0829015073.

The spelling of 139865361 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, three hundred sixty-one".