1056821517 has 6 divisors (see below), whose sum is σ = 1526519982. Its totient is φ = 704547672.

The previous prime is 1056821501. The next prime is 1056821531. The reversal of 1056821517 is 7151286501.

1056821517 is a `hidden beast` number, since 10 + 56 + 82 + 1 + 517 = 666.

It can be written as a sum of positive squares in only one way, i.e., 932141961 + 124679556 = 30531^2 + 11166^2 .

It is not a de Polignac number, because 1056821517 - 2⁴ = 1056821501 is a prime.

It is a super-2 number, since 2×1056821517² = 2233743437588362578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056820517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58712298 + ... + 58712315.

It is an arithmetic number, because the mean of its divisors is an integer number (254419997).

Almost surely, 2^1056821517 is an apocalyptic number.

It is an amenable number.

1056821517 is a deficient number, since it is larger than the sum of its proper divisors (469698465).

1056821517 is a wasteful number, since it uses less digits than its factorization.

1056821517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117424619 (or 117424616 counting only the distinct ones).

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

The square root of 1056821517 is about 32508.7913801790. The cubic root of 1056821517 is about 1018.5926756594.

The spelling of 1056821517 in words is "one billion, fifty-six million, eight hundred twenty-one thousand, five hundred seventeen".