545993509 has 4 divisors (see below), whose sum is σ = 547716204. Its totient is φ = 544270816.

The previous prime is 545993477. The next prime is 545993531. The reversal of 545993509 is 905399545.

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 239568484 + 306425025 = 15478^2 + 17505^2 .

It is a cyclic number.

It is not a de Polignac number, because 545993509 - 2⁵ = 545993477 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 (545993579) 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, 860872 + ... + 861505.

It is an arithmetic number, because the mean of its divisors is an integer number (136929051).

Almost surely, 2^545993509 is an apocalyptic number.

It is an amenable number.

545993509 is a deficient number, since it is larger than the sum of its proper divisors (1722695).

545993509 is a wasteful number, since it uses less digits than its factorization.

545993509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722694.

The product of its (nonzero) digits is 1093500, while the sum is 49.

The square root of 545993509 is about 23366.5039961052. The cubic root of 545993509 is about 817.3269636605.

The spelling of 545993509 in words is "five hundred forty-five million, nine hundred ninety-three thousand, five hundred nine".