551000165 has 4 divisors (see below), whose sum is σ = 661200204. Its totient is φ = 440800128.

The previous prime is 551000159. The next prime is 551000183. The reversal of 551000165 is 561000155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561000155 = 5 ⋅112200031.

It can be written as a sum of positive squares in 2 ways, for example, as 386083201 + 164916964 = 19649^2 + 12842^2 .

It is a cyclic number.

It is not a de Polignac number, because 551000165 - 2⁶ = 551000101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 551000165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55100012 + ... + 55100021.

It is an arithmetic number, because the mean of its divisors is an integer number (165300051).

Almost surely, 2^551000165 is an apocalyptic number.

It is an amenable number.

551000165 is a deficient number, since it is larger than the sum of its proper divisors (110200039).

551000165 is a wasteful number, since it uses less digits than its factorization.

551000165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110200038.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 551000165 is about 23473.3927032289. The cubic root of 551000165 is about 819.8176101386.

The spelling of 551000165 in words is "five hundred fifty-one million, one hundred sixty-five", and thus it is an aban number.