551078217 has 12 divisors (see below), whose sum is σ = 796585140. Its totient is φ = 367116288.

The previous prime is 551078191. The next prime is 551078219. The reversal of 551078217 is 712870155.

It can be written as a sum of positive squares in 2 ways, for example, as 124077321 + 427000896 = 11139^2 + 20664^2 .

It is not a de Polignac number, because 551078217 - 2¹⁵ = 551045449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551078219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9048 + ... + 34409.

It is an arithmetic number, because the mean of its divisors is an integer number (66382095).

Almost surely, 2^551078217 is an apocalyptic number.

It is an amenable number.

551078217 is a deficient number, since it is larger than the sum of its proper divisors (245506923).

551078217 is a wasteful number, since it uses less digits than its factorization.

551078217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44872 (or 44869 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 551078217 is about 23475.0552076028. The cubic root of 551078217 is about 819.8563187676.

The spelling of 551078217 in words is "five hundred fifty-one million, seventy-eight thousand, two hundred seventeen".