551280805 has 8 divisors (see below), whose sum is σ = 661778712. Its totient is φ = 440863488.

The previous prime is 551280803. The next prime is 551280841. The reversal of 551280805 is 508082155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 162639009 + 388641796 = 12753^2 + 19714^2 .

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 551280805 - 2¹ = 551280803 is a prime.

It is a super-2 number, since 2×551280805² = 607821051922896050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551280803) 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, 3904 + ... + 33433.

It is an arithmetic number, because the mean of its divisors is an integer number (82722339).

Almost surely, 2^551280805 is an apocalyptic number.

It is an amenable number.

551280805 is a deficient number, since it is larger than the sum of its proper divisors (110497907).

551280805 is a wasteful number, since it uses less digits than its factorization.

551280805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40295.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 551280805 is about 23479.3697743359. The cubic root of 551280805 is about 819.9567719627.

The spelling of 551280805 in words is "five hundred fifty-one million, two hundred eighty thousand, eight hundred five".