551220405 has 16 divisors (see below), whose sum is σ = 898594560. Its totient is φ = 288436928.

The previous prime is 551220403. The next prime is 551220473. The reversal of 551220405 is 504022155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 551220405 - 2¹ = 551220403 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551220401) 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, 345885 + ... + 347474.

It is an arithmetic number, because the mean of its divisors is an integer number (56162160).

Almost surely, 2^551220405 is an apocalyptic number.

It is an amenable number.

551220405 is a deficient number, since it is larger than the sum of its proper divisors (347374155).

551220405 is a wasteful number, since it uses less digits than its factorization.

551220405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693420.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 551220405 is about 23478.0835035571. The cubic root of 551220405 is about 819.9268252172.

The spelling of 551220405 in words is "five hundred fifty-one million, two hundred twenty thousand, four hundred five".