1056425521 has 4 divisors (see below), whose sum is σ = 1076358132. Its totient is φ = 1036492912.

The previous prime is 1056425519. The next prime is 1056425551. The reversal of 1056425521 is 1255246501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1255246501 = 19709 ⋅63689.

It can be written as a sum of positive squares in 2 ways, for example, as 456420496 + 600005025 = 21364^2 + 24495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056425521 - 2¹ = 1056425519 is a prime.

It is a super-2 number, since 2×1056425521² = 2232069762840242882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1056425551) 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 3 ways as a sum of consecutive naturals, for example, 9966226 + ... + 9966331.

It is an arithmetic number, because the mean of its divisors is an integer number (269089533).

Almost surely, 2^1056425521 is an apocalyptic number.

It is an amenable number.

1056425521 is a deficient number, since it is larger than the sum of its proper divisors (19932611).

1056425521 is an equidigital number, since it uses as much as digits as its factorization.

1056425521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19932610.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1056425521 is about 32502.7002109056. The cubic root of 1056425521 is about 1018.4654359413.

The spelling of 1056425521 in words is "one billion, fifty-six million, four hundred twenty-five thousand, five hundred twenty-one".