11861831698201 has 3 divisors (see below), whose sum is σ = 11861835142303. Its totient is φ = 11861828254100.

The previous prime is 11861831698153. The next prime is 11861831698217. The reversal of 11861831698201 is 10289613816811.

The square root of 11861831698201 is 3444101.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8122790702601 + 3739040995600 = 2850051^2 + 1933660^2 .

It is not a de Polignac number, because 11861831698201 - 2¹¹ = 11861831696153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11861831698261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1722051 + ... + 5166151.

Almost surely, 2^{11861831698201} is an apocalyptic number.

11861831698201 is the 3444101-st square number.

11861831698201 is the 1722051-st centered octagonal number.

It is an amenable number.

11861831698201 is a deficient number, since it is larger than the sum of its proper divisors (3444102).

11861831698201 is an frugal number, since it uses more digits than its factorization.

11861831698201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6888202 (or 3444101 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 55.

The spelling of 11861831698201 in words is "eleven trillion, eight hundred sixty-one billion, eight hundred thirty-one million, six hundred ninety-eight thousand, two hundred one".