1055431521 has 24 divisors (see below), whose sum is σ = 1593558720. Its totient is φ = 671859936.

The previous prime is 1055431441. The next prime is 1055431537. The reversal of 1055431521 is 1251345501.

1055431521 is a `hidden beast` number, since 105 + 5 + 4 + 31 + 521 = 666.

It is not a de Polignac number, because 1055431521 - 2⁷ = 1055431393 is a prime.

It is a super-2 number, since 2×1055431521² = 2227871391040746882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1055431541) 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 23 ways as a sum of consecutive naturals, for example, 124015 + ... + 132251.

It is an arithmetic number, because the mean of its divisors is an integer number (66398280).

Almost surely, 2^1055431521 is an apocalyptic number.

It is an amenable number.

1055431521 is a deficient number, since it is larger than the sum of its proper divisors (538127199).

1055431521 is a wasteful number, since it uses less digits than its factorization.

1055431521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8885 (or 8882 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1055431521 is about 32487.4055750840. The cubic root of 1055431521 is about 1018.1459080300.

The spelling of 1055431521 in words is "one billion, fifty-five million, four hundred thirty-one thousand, five hundred twenty-one".