1056538981 has 4 divisors (see below), whose sum is σ = 1058157612. Its totient is φ = 1054920352.

The previous prime is 1056538979. The next prime is 1056539041. The reversal of 1056538981 is 1898356501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142444225 + 914094756 = 11935^2 + 30234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056538981 - 2¹ = 1056538979 is a prime.

It is a super-2 number, since 2×1056538981² = 2232549236745036722, 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 (1056538961) 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, 808336 + ... + 809641.

It is an arithmetic number, because the mean of its divisors is an integer number (264539403).

Almost surely, 2^1056538981 is an apocalyptic number.

It is an amenable number.

1056538981 is a deficient number, since it is larger than the sum of its proper divisors (1618631).

1056538981 is an equidigital number, since it uses as much as digits as its factorization.

1056538981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618630.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1056538981 is about 32504.4455574926. The cubic root of 1056538981 is about 1018.5018956662.

The spelling of 1056538981 in words is "one billion, fifty-six million, five hundred thirty-eight thousand, nine hundred eighty-one".