139228361 has 4 divisors (see below), whose sum is σ = 145281792. Its totient is φ = 133174932.

The previous prime is 139228357. The next prime is 139228363. The reversal of 139228361 is 163822931.

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 139228361 - 2² = 139228357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139228363) 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, 3026681 + ... + 3026726.

It is an arithmetic number, because the mean of its divisors is an integer number (36320448).

Almost surely, 2^139228361 is an apocalyptic number.

It is an amenable number.

139228361 is a deficient number, since it is larger than the sum of its proper divisors (6053431).

139228361 is an equidigital number, since it uses as much as digits as its factorization.

139228361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6053430.

The product of its digits is 15552, while the sum is 35.

The square root of 139228361 is about 11799.5068117273. The cubic root of 139228361 is about 518.2936685448.

The spelling of 139228361 in words is "one hundred thirty-nine million, two hundred twenty-eight thousand, three hundred sixty-one".