551221249 has 4 divisors (see below), whose sum is σ = 551335680. Its totient is φ = 551106820.

The previous prime is 551221219. The next prime is 551221271. The reversal of 551221249 is 942122155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551221249 - 2¹³ = 551213057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551221249.

It is not an unprimeable number, because it can be changed into a prime (551221219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49657 + ... + 59734.

It is an arithmetic number, because the mean of its divisors is an integer number (137833920).

Almost surely, 2^551221249 is an apocalyptic number.

It is an amenable number.

551221249 is a deficient number, since it is larger than the sum of its proper divisors (114431).

551221249 is a wasteful number, since it uses less digits than its factorization.

551221249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114430.

The product of its digits is 7200, while the sum is 31.

The square root of 551221249 is about 23478.1014777601. The cubic root of 551221249 is about 819.9272436934.

The spelling of 551221249 in words is "five hundred fifty-one million, two hundred twenty-one thousand, two hundred forty-nine".