2139979859689 has 81 divisors (see below), whose sum is σ = 2795236310583. Its totient is φ = 1632980877696.

The previous prime is 2139979859659. The next prime is 2139979859747. The reversal of 2139979859689 is 9869589799312.

The square root of 2139979859689 is 1462867.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1666074285225 + 473905574464 = 1290765^2 + 688408^2 .

It is not a de Polignac number, because 2139979859689 - 2⁹ = 2139979859177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139979859659) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 3307541964 + ... + 3307542610.

Almost surely, 2^{2139979859689} is an apocalyptic number.

2139979859689 is the 1462867-th square number.

2139979859689 is the 731434-th centered octagonal number.

It is an amenable number.

2139979859689 is a deficient number, since it is larger than the sum of its proper divisors (655256450894).

2139979859689 is an frugal number, since it uses more digits than its factorization.

2139979859689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 690 counting only the distinct ones).

The product of its digits is 4761711360, while the sum is 85.

The spelling of 2139979859689 in words is "two trillion, one hundred thirty-nine billion, nine hundred seventy-nine million, eight hundred fifty-nine thousand, six hundred eighty-nine".