551561535 has 64 divisors (see below), whose sum is σ = 1123599360. Its totient is φ = 251475840.

The previous prime is 551561533. The next prime is 551561539. The reversal of 551561535 is 535165155.

551561535 is a `hidden beast` number, since 5 + 5 + 1 + 5 + 615 + 35 = 666.

It is not a de Polignac number, because 551561535 - 2¹ = 551561533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551561535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551561533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 624204 + ... + 625086.

It is an arithmetic number, because the mean of its divisors is an integer number (17556240).

Almost surely, 2^551561535 is an apocalyptic number.

551561535 is an abundant number, since it is smaller than the sum of its proper divisors (572037825).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551561535 is a wasteful number, since it uses less digits than its factorization.

551561535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1559 counting only the distinct ones).

The product of its digits is 56250, while the sum is 36.

The square root of 551561535 is about 23485.3472403539. The cubic root of 551561535 is about 820.0959311720.

The spelling of 551561535 in words is "five hundred fifty-one million, five hundred sixty-one thousand, five hundred thirty-five".