548647861 has 4 divisors (see below), whose sum is σ = 549072172. Its totient is φ = 548223552.

The previous prime is 548647859. The next prime is 548647867. The reversal of 548647861 is 168746845.

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 368256100 + 180391761 = 19190^2 + 13431^2 .

It is a cyclic number.

It is not a de Polignac number, because 548647861 - 2¹ = 548647859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (548647867) 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, 210210 + ... + 212803.

It is an arithmetic number, because the mean of its divisors is an integer number (137268043).

Almost surely, 2^548647861 is an apocalyptic number.

It is an amenable number.

548647861 is a deficient number, since it is larger than the sum of its proper divisors (424311).

548647861 is a wasteful number, since it uses less digits than its factorization.

548647861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424310.

The product of its digits is 1290240, while the sum is 49.

The square root of 548647861 is about 23423.2333592098. The cubic root of 548647861 is about 818.6493037321.

The spelling of 548647861 in words is "five hundred forty-eight million, six hundred forty-seven thousand, eight hundred sixty-one".