11547147397 has 4 divisors (see below), whose sum is σ = 11547362476. Its totient is φ = 11546932320.

The previous prime is 11547147377. The next prime is 11547147427. The reversal of 11547147397 is 79374174511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79374174511 = 1453 ⋅54627787.

It can be written as a sum of positive squares in 2 ways, for example, as 4726700001 + 6820447396 = 68751^2 + 82586^2 .

It is a cyclic number.

It is not a de Polignac number, because 11547147397 - 2²⁷ = 11412929669 is a prime.

It is a super-2 number, since 2×11547147397² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11547147397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11547147307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47497 + ... + 159217.

It is an arithmetic number, because the mean of its divisors is an integer number (2886840619).

Almost surely, 2^11547147397 is an apocalyptic number.

It is an amenable number.

11547147397 is a deficient number, since it is larger than the sum of its proper divisors (215079).

11547147397 is a wasteful number, since it uses less digits than its factorization.

11547147397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215078.

The product of its digits is 740880, while the sum is 49.

The spelling of 11547147397 in words is "eleven billion, five hundred forty-seven million, one hundred forty-seven thousand, three hundred ninety-seven".