11147347561 has 9 divisors (see below), whose sum is σ = 12968182461. Its totient is φ = 9554235852.

The previous prime is 11147347511. The next prime is 11147347571. The reversal of 11147347561 is 16574374111.

The square root of 11147347561 is 105581.

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

It is not a de Polignac number, because 11147347561 - 2¹¹ = 11147345513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11147347511) 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, 731526 + ... + 746608.

Almost surely, 2^11147347561 is an apocalyptic number.

11147347561 is the 105581-st square number.

11147347561 is the 52791-st centered octagonal number.

It is an amenable number.

11147347561 is a deficient number, since it is larger than the sum of its proper divisors (1820834900).

11147347561 is an frugal number, since it uses more digits than its factorization.

11147347561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30180 (or 15090 counting only the distinct ones).

The product of its digits is 70560, while the sum is 40.

The spelling of 11147347561 in words is "eleven billion, one hundred forty-seven million, three hundred forty-seven thousand, five hundred sixty-one".