1055521521 has 6 divisors (see below), whose sum is σ = 1524642210. Its totient is φ = 703681008.

The previous prime is 1055521487. The next prime is 1055521529. The reversal of 1055521521 is 1251255501.

1055521521 is a `hidden beast` number, since 105 + 552 + 1 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 702833121 + 352688400 = 26511^2 + 18780^2 .

It is not a de Polignac number, because 1055521521 - 2⁶ = 1055521457 is a prime.

It is a super-2 number, since 2×1055521521² = 2228251362588306882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1055521529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58640076 + ... + 58640093.

It is an arithmetic number, because the mean of its divisors is an integer number (254107035).

Almost surely, 2^1055521521 is an apocalyptic number.

It is an amenable number.

1055521521 is a deficient number, since it is larger than the sum of its proper divisors (469120689).

1055521521 is a wasteful number, since it uses less digits than its factorization.

1055521521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117280175 (or 117280172 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1055521521 is about 32488.7906977160. The cubic root of 1055521521 is about 1018.1748473865.

The spelling of 1055521521 in words is "one billion, fifty-five million, five hundred twenty-one thousand, five hundred twenty-one".