551020561 has 16 divisors (see below), whose sum is σ = 701568000. Its totient is φ = 420936768.

The previous prime is 551020559. The next prime is 551020573. The reversal of 551020561 is 165020155.

It is not a de Polignac number, because 551020561 - 2¹ = 551020559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551020511) 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 15 ways as a sum of consecutive naturals, for example, 101761 + ... + 107038.

It is an arithmetic number, because the mean of its divisors is an integer number (43848000).

Almost surely, 2^551020561 is an apocalyptic number.

It is an amenable number.

551020561 is a deficient number, since it is larger than the sum of its proper divisors (150547439).

551020561 is a wasteful number, since it uses less digits than its factorization.

551020561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208848.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 551020561 is about 23473.8271485499. The cubic root of 551020561 is about 819.8277255582.

The spelling of 551020561 in words is "five hundred fifty-one million, twenty thousand, five hundred sixty-one".