139663361 has 4 divisors (see below), whose sum is σ = 139879872. Its totient is φ = 139446852.

The previous prime is 139663331. The next prime is 139663369. The reversal of 139663361 is 163366931.

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 139663361 - 2²⁶ = 72554497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139663369) 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, 107285 + ... + 108578.

It is an arithmetic number, because the mean of its divisors is an integer number (34969968).

Almost surely, 2^139663361 is an apocalyptic number.

It is an amenable number.

139663361 is a deficient number, since it is larger than the sum of its proper divisors (216511).

139663361 is an equidigital number, since it uses as much as digits as its factorization.

139663361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216510.

The product of its digits is 52488, while the sum is 38.

The square root of 139663361 is about 11817.9254101555. The cubic root of 139663361 is about 518.8328866249.

The spelling of 139663361 in words is "one hundred thirty-nine million, six hundred sixty-three thousand, three hundred sixty-one".