551287505 has 4 divisors (see below), whose sum is σ = 661545012. Its totient is φ = 441030000.

The previous prime is 551287493. The next prime is 551287537. The reversal of 551287505 is 505782155.

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 58491904 + 492795601 = 7648^2 + 22199^2 .

It is not a de Polignac number, because 551287505 - 2⁸ = 551287249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55128746 + ... + 55128755.

It is an arithmetic number, because the mean of its divisors is an integer number (165386253).

Almost surely, 2^551287505 is an apocalyptic number.

It is an amenable number.

551287505 is a deficient number, since it is larger than the sum of its proper divisors (110257507).

551287505 is a wasteful number, since it uses less digits than its factorization.

551287505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110257506.

The product of its (nonzero) digits is 70000, while the sum is 38.

The square root of 551287505 is about 23479.5124523487. The cubic root of 551287505 is about 819.9600937351.

The spelling of 551287505 in words is "five hundred fifty-one million, two hundred eighty-seven thousand, five hundred five".