139121245 has 8 divisors (see below), whose sum is σ = 167253984. Its totient is φ = 111091344.

The previous prime is 139121231. The next prime is 139121309. The reversal of 139121245 is 542121931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139121245 - 2⁷ = 139121117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22699 + ... + 28168.

It is an arithmetic number, because the mean of its divisors is an integer number (20906748).

Almost surely, 2^139121245 is an apocalyptic number.

It is an amenable number.

139121245 is a deficient number, since it is larger than the sum of its proper divisors (28132739).

139121245 is an equidigital number, since it uses as much as digits as its factorization.

139121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51419.

The product of its digits is 2160, while the sum is 28.

The square root of 139121245 is about 11794.9669350957. The cubic root of 139121245 is about 518.1607172125.

The spelling of 139121245 in words is "one hundred thirty-nine million, one hundred twenty-one thousand, two hundred forty-five".