549781541 has 4 divisors (see below), whose sum is σ = 553471500. Its totient is φ = 546091584.

The previous prime is 549781523. The next prime is 549781543. The reversal of 549781541 is 145187945.

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 113848900 + 435932641 = 10670^2 + 20879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549781541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 549781492 and 549781501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549781543) 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, 1844756 + ... + 1845053.

It is an arithmetic number, because the mean of its divisors is an integer number (138367875).

Almost surely, 2^549781541 is an apocalyptic number.

It is an amenable number.

549781541 is a deficient number, since it is larger than the sum of its proper divisors (3689959).

549781541 is a wasteful number, since it uses less digits than its factorization.

549781541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689958.

The product of its digits is 201600, while the sum is 44.

The square root of 549781541 is about 23447.4207750021. The cubic root of 549781541 is about 819.2127785954.

The spelling of 549781541 in words is "five hundred forty-nine million, seven hundred eighty-one thousand, five hundred forty-one".