551265 has 32 divisors (see below), whose sum is σ = 1040256. Its totient is φ = 245760.

The previous prime is 551233. The next prime is 551269. The reversal of 551265 is 562155.

551265 = T₆ + T₇ + ... + T₁₄₈.

551265 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 551265 - 2⁵ = 551233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2017 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (32508).

2⁵⁵¹²⁶⁵ is an apocalyptic number.

551265 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

551265 is the 429-th octagonal number.

It is an amenable number.

551265 is a deficient number, since it is larger than the sum of its proper divisors (488991).

551265 is a wasteful number, since it uses less digits than its factorization.

551265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 1500, while the sum is 24.

The square root of 551265 is about 742.4722217026. The cubic root of 551265 is about 81.9948935944.

The spelling of 551265 in words is "five hundred fifty-one thousand, two hundred sixty-five".