54197554781 has 4 divisors (see below), whose sum is σ = 54209473500. Its totient is φ = 54185636064.

The previous prime is 54197554759. The next prime is 54197554783. The reversal of 54197554781 is 18745579145.

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 20906268100 + 33291286681 = 144590^2 + 182459^2 .

It is a cyclic number.

It is not a de Polignac number, because 54197554781 - 2¹⁴ = 54197538397 is a prime.

It is a super-2 number, since 2×54197554781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54197554783) 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, 5952536 + ... + 5961633.

It is an arithmetic number, because the mean of its divisors is an integer number (13552368375).

Almost surely, 2^54197554781 is an apocalyptic number.

It is an amenable number.

54197554781 is a deficient number, since it is larger than the sum of its proper divisors (11918719).

54197554781 is a wasteful number, since it uses less digits than its factorization.

54197554781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918718.

The product of its digits is 7056000, while the sum is 56.

The spelling of 54197554781 in words is "fifty-four billion, one hundred ninety-seven million, five hundred fifty-four thousand, seven hundred eighty-one".