1055530521 has 12 divisors (see below), whose sum is σ = 1581124272. Its totient is φ = 703686852.

The previous prime is 1055530471. The next prime is 1055530537. The reversal of 1055530521 is 1250355501.

1055530521 is a `hidden beast` number, since 105 + 5 + 5 + 30 + 521 = 666.

It is not a de Polignac number, because 1055530521 - 2¹¹ = 1055528473 is a prime.

It is a super-2 number, since 2×1055530521² = 2228289361525062882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1055530571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2171631 + ... + 2172116.

It is an arithmetic number, because the mean of its divisors is an integer number (131760356).

Almost surely, 2^1055530521 is an apocalyptic number.

It is an amenable number.

1055530521 is a deficient number, since it is larger than the sum of its proper divisors (525593751).

1055530521 is an frugal number, since it uses more digits than its factorization.

1055530521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343762 (or 4343750 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 1055530521 is about 32488.9292067313. The cubic root of 1055530521 is about 1018.1777412317.

The spelling of 1055530521 in words is "one billion, fifty-five million, five hundred thirty thousand, five hundred twenty-one".