11471909449 has 81 divisors (see below), whose sum is σ = 16033291911. Its totient is φ = 8174406240.

The previous prime is 11471909447. The next prime is 11471909461. The reversal of 11471909449 is 94490917411.

The square root of 11471909449 is 107107.

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., 1697028025 + 9774881424 = 41195^2 + 98868^2 .

It is not a de Polignac number, because 11471909449 - 2¹ = 11471909447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (11471909441) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 107214054 + ... + 107214160.

Almost surely, 2^11471909449 is an apocalyptic number.

11471909449 is the 107107-th square number.

11471909449 is the 53554-th centered octagonal number.

It is an amenable number.

11471909449 is a deficient number, since it is larger than the sum of its proper divisors (4561382462).

11471909449 is a wasteful number, since it uses less digits than its factorization.

11471909449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

Multiplying 11471909449 by its sum of digits (49), we get a square (562123563001 = 749749²).

11471909449 divided by its sum of digits (49) gives a square (234120601 = 15301²).

The spelling of 11471909449 in words is "eleven billion, four hundred seventy-one million, nine hundred nine thousand, four hundred forty-nine".