551632813 has 4 divisors (see below), whose sum is σ = 584081820. Its totient is φ = 519183808.

The previous prime is 551632801. The next prime is 551632883. The reversal of 551632813 is 318236155.

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 258469929 + 293162884 = 16077^2 + 17122^2 .

It is not a de Polignac number, because 551632813 - 2¹³ = 551624621 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 (551632883) 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, 16224478 + ... + 16224511.

It is an arithmetic number, because the mean of its divisors is an integer number (146020455).

Almost surely, 2^551632813 is an apocalyptic number.

It is an amenable number.

551632813 is a deficient number, since it is larger than the sum of its proper divisors (32449007).

551632813 is a wasteful number, since it uses less digits than its factorization.

551632813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32449006.

The product of its digits is 21600, while the sum is 34.

The square root of 551632813 is about 23486.8646907160. The cubic root of 551632813 is about 820.1312565022.

Adding to 551632813 its reverse (318236155), we get a palindrome (869868968).

The spelling of 551632813 in words is "five hundred fifty-one million, six hundred thirty-two thousand, eight hundred thirteen".