11549275481 has 4 divisors (see below), whose sum is σ = 11554408464. Its totient is φ = 11544142500.

The previous prime is 11549275477. The next prime is 11549275483. The reversal of 11549275481 is 18457294511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11549275481 - 2² = 11549275477 is a prime.

It is a super-2 number, since 2×11549275481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11549275483) 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, 2563115 + ... + 2567616.

It is an arithmetic number, because the mean of its divisors is an integer number (2888602116).

Almost surely, 2^11549275481 is an apocalyptic number.

It is an amenable number.

11549275481 is a deficient number, since it is larger than the sum of its proper divisors (5132983).

11549275481 is an equidigital number, since it uses as much as digits as its factorization.

11549275481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132982.

The product of its digits is 403200, while the sum is 47.

The spelling of 11549275481 in words is "eleven billion, five hundred forty-nine million, two hundred seventy-five thousand, four hundred eighty-one".