549781667 has 4 divisors (see below), whose sum is σ = 560154960. Its totient is φ = 539408376.

The previous prime is 549781657. The next prime is 549781679. The reversal of 549781667 is 766187945.

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

It is a cyclic number.

It is not a de Polignac number, because 549781667 - 2¹⁰ = 549780643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 10373239 = 549781667 / (5 + 4 + 9 + 7 + 8 + 1 + 6 + 6 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549781637) 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, 5186567 + ... + 5186672.

It is an arithmetic number, because the mean of its divisors is an integer number (140038740).

Almost surely, 2^549781667 is an apocalyptic number.

549781667 is a deficient number, since it is larger than the sum of its proper divisors (10373293).

549781667 is a wasteful number, since it uses less digits than its factorization.

549781667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373292.

The product of its digits is 2540160, while the sum is 53.

The square root of 549781667 is about 23447.4234618646. The cubic root of 549781667 is about 819.2128411784.

The spelling of 549781667 in words is "five hundred forty-nine million, seven hundred eighty-one thousand, six hundred sixty-seven".