551220513 has 16 divisors (see below), whose sum is σ = 749715456. Its totient is φ = 360173520.

The previous prime is 551220503. The next prime is 551220541. The reversal of 551220513 is 315022155.

It is a happy number.

It is not a de Polignac number, because 551220513 - 2⁴ = 551220497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551220503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22908 + ... + 40338.

It is an arithmetic number, because the mean of its divisors is an integer number (46857216).

Almost surely, 2^551220513 is an apocalyptic number.

It is an amenable number.

551220513 is a deficient number, since it is larger than the sum of its proper divisors (198494943).

551220513 is a wasteful number, since it uses less digits than its factorization.

551220513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17644.

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

The square root of 551220513 is about 23478.0858035744. The cubic root of 551220513 is about 819.9268787663.

Adding to 551220513 its reverse (315022155), we get a palindrome (866242668).

The spelling of 551220513 in words is "five hundred fifty-one million, two hundred twenty thousand, five hundred thirteen".