1056978721 has 8 divisors (see below), whose sum is σ = 1113328800. Its totient is φ = 1000700640.

The previous prime is 1056978719. The next prime is 1056978739. The reversal of 1056978721 is 1278796501.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1056978721 - 2¹ = 1056978719 is a prime.

It is a super-2 number, since 2×1056978721² = 2234408033293591682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056978751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13581 + ... + 47941.

It is an arithmetic number, because the mean of its divisors is an integer number (139166100).

Almost surely, 2^1056978721 is an apocalyptic number.

It is an amenable number.

1056978721 is a deficient number, since it is larger than the sum of its proper divisors (56350079).

1056978721 is a wasteful number, since it uses less digits than its factorization.

1056978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35999.

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 1056978721 is about 32511.2091593038. The cubic root of 1056978721 is about 1018.6431789536.

The spelling of 1056978721 in words is "one billion, fifty-six million, nine hundred seventy-eight thousand, seven hundred twenty-one".