1056521 has 2 divisors, whose sum is σ = 1056522. Its totient is φ = 1056520.

The previous prime is 1056509. The next prime is 1056541. The reversal of 1056521 is 1256501.

It is an a-pointer prime, because the next prime (1056541) can be obtained adding 1056521 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978121 + 78400 = 989^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1056521 is a prime.

It is a super-2 number, since 2×1056521² = 2232473246882, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1056493 and 1056502.

It is not a weakly prime, because it can be changed into another prime (1056541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528260 + 528261.

It is an arithmetic number, because the mean of its divisors is an integer number (528261).

2^1056521 is an apocalyptic number.

It is an amenable number.

1056521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056521 is an equidigital number, since it uses as much as digits as its factorization.

1056521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1056521 is about 1027.8720737524. The cubic root of 1056521 is about 101.8496117748.

Subtracting from 1056521 its sum of digits (20), we obtain a palindrome (1056501).

The spelling of 1056521 in words is "one million, fifty-six thousand, five hundred twenty-one".