11420983161 has 45 divisors (see below), whose sum is σ = 19271835141. Its totient is φ = 6517299096.

The previous prime is 11420983159. The next prime is 11420983199. The reversal of 11420983161 is 16138902411.

The square root of 11420983161 is 106869.

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

It is not a de Polignac number, because 11420983161 - 2¹ = 11420983159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11420983121) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 15709380 + ... + 15710106.

Almost surely, 2^11420983161 is an apocalyptic number.

11420983161 is the 106869-th square number.

11420983161 is the 53435-th centered octagonal number.

It is an amenable number.

11420983161 is a deficient number, since it is larger than the sum of its proper divisors (7850851980).

11420983161 is an frugal number, since it uses more digits than its factorization.

11420983161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

Multiplying 11420983161 by its sum of digits (36), we get a square (411155393796 = 641214²).

The spelling of 11420983161 in words is "eleven billion, four hundred twenty million, nine hundred eighty-three thousand, one hundred sixty-one".