11454478781 has 4 divisors (see below), whose sum is σ = 11567889564. Its totient is φ = 11341068000.

The previous prime is 11454478727. The next prime is 11454478787. The reversal of 11454478781 is 18787445411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7886328025 + 3568150756 = 88805^2 + 59734^2 .

It is a cyclic number.

It is not a de Polignac number, because 11454478781 - 2¹⁰ = 11454477757 is a prime.

It is a super-3 number, since 3×11454478781³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11454478787) 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, 56705240 + ... + 56705441.

It is an arithmetic number, because the mean of its divisors is an integer number (2891972391).

Almost surely, 2^11454478781 is an apocalyptic number.

It is an amenable number.

11454478781 is a deficient number, since it is larger than the sum of its proper divisors (113410783).

11454478781 is a wasteful number, since it uses less digits than its factorization.

11454478781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113410782.

The product of its digits is 1003520, while the sum is 50.

The spelling of 11454478781 in words is "eleven billion, four hundred fifty-four million, four hundred seventy-eight thousand, seven hundred eighty-one".