139121656 has 8 divisors (see below), whose sum is σ = 260853120. Its totient is φ = 69560824.

The previous prime is 139121639. The next prime is 139121657. The reversal of 139121656 is 656121931.

139121656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139121657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8695096 + ... + 8695111.

It is an arithmetic number, because the mean of its divisors is an integer number (32606640).

Almost surely, 2^139121656 is an apocalyptic number.

It is an amenable number.

139121656 is a deficient number, since it is larger than the sum of its proper divisors (121731464).

139121656 is a wasteful number, since it uses less digits than its factorization.

139121656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17390213 (or 17390209 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 139121656 is about 11794.9843577683. The cubic root of 139121656 is about 518.1612274721.

The spelling of 139121656 in words is "one hundred thirty-nine million, one hundred twenty-one thousand, six hundred fifty-six".