11871739000521 has 9 divisors (see below), whose sum is σ = 17148082375879. Its totient is φ = 7914485775936.

The previous prime is 11871739000487. The next prime is 11871739000553. The reversal of 11871739000521 is 12500093717811.

The square root of 11871739000521 is 3445539.

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

11871739000521 is a `hidden beast` number, since 1 + 1 + 87 + 17 + 39 + 0 + 0 + 0 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1247164065225 + 10624574935296 = 1116765^2 + 3259536^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 11871739000521 - 2²⁹ = 11871202129609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11871739000021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9762361 + ... + 10910873.

Almost surely, 2^{11871739000521} is an apocalyptic number.

11871739000521 is the 3445539-th square number.

11871739000521 is the 1722770-th centered octagonal number.

It is an amenable number.

11871739000521 is a deficient number, since it is larger than the sum of its proper divisors (5276343375358).

11871739000521 is an frugal number, since it uses more digits than its factorization.

11871739000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297032 (or 1148516 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 45.

The spelling of 11871739000521 in words is "eleven trillion, eight hundred seventy-one billion, seven hundred thirty-nine million, five hundred twenty-one", and thus it is an aban number.