551808405 has 24 divisors (see below), whose sum is σ = 957017880. Its totient is φ = 294128640.

The previous prime is 551808391. The next prime is 551808407. The reversal of 551808405 is 504808155.

It can be written as a sum of positive squares in 4 ways, for example, as 35928036 + 515880369 = 5994^2 + 22713^2 .

It is not a de Polignac number, because 551808405 - 2⁵ = 551808373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551808405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551808407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138481 + ... + 142409.

It is an arithmetic number, because the mean of its divisors is an integer number (39875745).

Almost surely, 2^551808405 is an apocalyptic number.

It is an amenable number.

551808405 is a deficient number, since it is larger than the sum of its proper divisors (405209475).

551808405 is a wasteful number, since it uses less digits than its factorization.

551808405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061 (or 7058 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 551808405 is about 23490.6024826951. The cubic root of 551808405 is about 820.2182668026.

The spelling of 551808405 in words is "five hundred fifty-one million, eight hundred eight thousand, four hundred five".