1056857121 has 24 divisors (see below), whose sum is σ = 1662336000. Its totient is φ = 644468832.

The previous prime is 1056857119. The next prime is 1056857141. The reversal of 1056857121 is 1217586501.

1056857121 is a `hidden beast` number, since 1 + 0 + 5 + 68 + 571 + 21 = 666.

It is not a de Polignac number, because 1056857121 - 2¹ = 1056857119 is a prime.

It is a super-2 number, since 2×1056857121² = 2233893948416817282, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1056857141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101601 + ... + 111518.

It is an arithmetic number, because the mean of its divisors is an integer number (69264000).

Almost surely, 2^1056857121 is an apocalyptic number.

It is an amenable number.

1056857121 is a deficient number, since it is larger than the sum of its proper divisors (605478879).

1056857121 is a wasteful number, since it uses less digits than its factorization.

1056857121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213173 (or 213170 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1056857121 is about 32509.3389812835. The cubic root of 1056857121 is about 1018.6041142249.

The spelling of 1056857121 in words is "one billion, fifty-six million, eight hundred fifty-seven thousand, one hundred twenty-one".