509550551 has 4 divisors (see below), whose sum is σ = 512676792. Its totient is φ = 506424312.

The previous prime is 509550521. The next prime is 509550563. The reversal of 509550551 is 155055905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155055905 = 5 ⋅31011181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509550551 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 (509550521) 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, 1562876 + ... + 1563201.

It is an arithmetic number, because the mean of its divisors is an integer number (128169198).

Almost surely, 2^509550551 is an apocalyptic number.

509550551 is a deficient number, since it is larger than the sum of its proper divisors (3126241).

509550551 is a wasteful number, since it uses less digits than its factorization.

509550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3126240.

The product of its (nonzero) digits is 28125, while the sum is 35.

The square root of 509550551 is about 22573.2264198098. The cubic root of 509550551 is about 798.7222054505.

The spelling of 509550551 in words is "five hundred nine million, five hundred fifty thousand, five hundred fifty-one".