551665121 has 8 divisors (see below), whose sum is σ = 631598784. Its totient is φ = 472012560.

The previous prime is 551665117. The next prime is 551665139. The reversal of 551665121 is 121566155.

551665121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551665121 - 2² = 551665117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551665141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66050 + ... + 73931.

It is an arithmetic number, because the mean of its divisors is an integer number (78949848).

Almost surely, 2^551665121 is an apocalyptic number.

It is an amenable number.

551665121 is a deficient number, since it is larger than the sum of its proper divisors (79933663).

551665121 is a wasteful number, since it uses less digits than its factorization.

551665121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140551.

The product of its digits is 9000, while the sum is 32.

The square root of 551665121 is about 23487.5524693400. The cubic root of 551665121 is about 820.1472673236.

The spelling of 551665121 in words is "five hundred fifty-one million, six hundred sixty-five thousand, one hundred twenty-one".