11983461961 has 3 divisors (see below), whose sum is σ = 11983571431. Its totient is φ = 11983352492.

The previous prime is 11983461929. The next prime is 11983461977. The reversal of 11983461961 is 16916438911.

The square root of 11983461961 is 109469.

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., 10359371961 + 1624090000 = 101781^2 + 40300^2 .

It is not a de Polignac number, because 11983461961 - 2⁵ = 11983461929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11983461991) 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, 54735 + ... + 164203.

Almost surely, 2^11983461961 is an apocalyptic number.

11983461961 is the 109469-th square number.

11983461961 is the 54735-th centered octagonal number.

It is an amenable number.

11983461961 is a deficient number, since it is larger than the sum of its proper divisors (109470).

11983461961 is an frugal number, since it uses more digits than its factorization.

11983461961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218938 (or 109469 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

Multiplying 11983461961 by its sum of digits (49), we get a square (587189636089 = 766283²).

The spelling of 11983461961 in words is "eleven billion, nine hundred eighty-three million, four hundred sixty-one thousand, nine hundred sixty-one".