551125121 has 4 divisors (see below), whose sum is σ = 551628612. Its totient is φ = 550621632.

The previous prime is 551125117. The next prime is 551125123. The reversal of 551125121 is 121521155.

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 242736400 + 308388721 = 15580^2 + 17561^2 .

It is a cyclic number.

It is not a de Polignac number, because 551125121 - 2² = 551125117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551125123) 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, 250100 + ... + 252293.

It is an arithmetic number, because the mean of its divisors is an integer number (137907153).

Almost surely, 2^551125121 is an apocalyptic number.

It is an amenable number.

551125121 is a deficient number, since it is larger than the sum of its proper divisors (503491).

551125121 is a wasteful number, since it uses less digits than its factorization.

551125121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503490.

The product of its digits is 500, while the sum is 23.

The square root of 551125121 is about 23476.0542042312. The cubic root of 551125121 is about 819.8795782909.

Adding to 551125121 its reverse (121521155), we get a palindrome (672646276).

The spelling of 551125121 in words is "five hundred fifty-one million, one hundred twenty-five thousand, one hundred twenty-one".