1056478981 has 4 divisors (see below), whose sum is σ = 1072247392. Its totient is φ = 1040710572.

The previous prime is 1056478967. The next prime is 1056478999. The reversal of 1056478981 is 1898746501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1898746501 = 37 ⋅51317473.

It is a cyclic number.

It is not a de Polignac number, because 1056478981 - 2⁵ = 1056478949 is a prime.

It is a super-2 number, since 2×1056478981² = 2232295674589596722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056478081) 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 3 ways as a sum of consecutive naturals, for example, 7884105 + ... + 7884238.

It is an arithmetic number, because the mean of its divisors is an integer number (268061848).

Almost surely, 2^1056478981 is an apocalyptic number.

It is an amenable number.

1056478981 is a deficient number, since it is larger than the sum of its proper divisors (15768411).

1056478981 is an equidigital number, since it uses as much as digits as its factorization.

1056478981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15768410.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 1056478981 is about 32503.5225937128. The cubic root of 1056478981 is about 1018.4826153331.

The spelling of 1056478981 in words is "one billion, fifty-six million, four hundred seventy-eight thousand, nine hundred eighty-one".