12139852761 has 27 divisors (see below), whose sum is σ = 18516409119. Its totient is φ = 7663308912.

The previous prime is 12139852727. The next prime is 12139852783. The reversal of 12139852761 is 16725893121.

The square root of 12139852761 is 110181.

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., 8265537225 + 3874315536 = 90915^2 + 62244^2 .

It is not a de Polignac number, because 12139852761 - 2¹⁷ = 12139721689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12139852261) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6279351 + ... + 6281283.

Almost surely, 2^12139852761 is an apocalyptic number.

12139852761 is the 110181-st square number.

12139852761 is the 55091-st centered octagonal number.

It is an amenable number.

12139852761 is a deficient number, since it is larger than the sum of its proper divisors (6376556358).

12139852761 is an frugal number, since it uses more digits than its factorization.

12139852761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910 (or 1955 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

It can be divided in two parts, 12139 and 852761, that added together give a square (864900 = 930²).

The spelling of 12139852761 in words is "twelve billion, one hundred thirty-nine million, eight hundred fifty-two thousand, seven hundred sixty-one".