549509901 has 4 divisors (see below), whose sum is σ = 732679872. Its totient is φ = 366339932.

The previous prime is 549509897. The next prime is 549509927. The reversal of 549509901 is 109905945.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 549509901 - 2² = 549509897 is a prime.

It is a super-2 number, since 2×549509901² = 603922262594059602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549509201) 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, 91584981 + ... + 91584986.

It is an arithmetic number, because the mean of its divisors is an integer number (183169968).

Almost surely, 2^549509901 is an apocalyptic number.

It is an amenable number.

549509901 is a deficient number, since it is larger than the sum of its proper divisors (183169971).

549509901 is a wasteful number, since it uses less digits than its factorization.

549509901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183169970.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 549509901 is about 23441.6275245555. The cubic root of 549509901 is about 819.0778355301.

The spelling of 549509901 in words is "five hundred forty-nine million, five hundred nine thousand, nine hundred one".