549451639 has 4 divisors (see below), whose sum is σ = 599401800. Its totient is φ = 499501480.

The previous prime is 549451631. The next prime is 549451649. The reversal of 549451639 is 936154945.

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 549451639 - 2³ = 549451631 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 (549451631) 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, 24975064 + ... + 24975085.

It is an arithmetic number, because the mean of its divisors is an integer number (149850450).

Almost surely, 2^549451639 is an apocalyptic number.

549451639 is a deficient number, since it is larger than the sum of its proper divisors (49950161).

549451639 is a wasteful number, since it uses less digits than its factorization.

549451639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49950160.

The product of its digits is 583200, while the sum is 46.

The square root of 549451639 is about 23440.3847877973. The cubic root of 549451639 is about 819.0488868255.

The spelling of 549451639 in words is "five hundred forty-nine million, four hundred fifty-one thousand, six hundred thirty-nine".