551220231 has 16 divisors (see below), whose sum is σ = 769395456. Its totient is φ = 350366016.

The previous prime is 551220227. The next prime is 551220239. The reversal of 551220231 is 132022155.

It is not a de Polignac number, because 551220231 - 2² = 551220227 is a prime.

It is a super-2 number, since 2×551220231² = 607687486127386722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 551220198 and 551220207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551220239) 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, 8836 + ... + 34358.

It is an arithmetic number, because the mean of its divisors is an integer number (48087216).

Almost surely, 2^551220231 is an apocalyptic number.

551220231 is a deficient number, since it is larger than the sum of its proper divisors (218175225).

551220231 is a wasteful number, since it uses less digits than its factorization.

551220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25862.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 551220231 is about 23478.0797979733. The cubic root of 551220231 is about 819.9267389436.

Adding to 551220231 its reverse (132022155), we get a palindrome (683242386).

The spelling of 551220231 in words is "five hundred fifty-one million, two hundred twenty thousand, two hundred thirty-one".