1056509 has 2 divisors, whose sum is σ = 1056510. Its totient is φ = 1056508.

The previous prime is 1056493. The next prime is 1056521. The reversal of 1056509 is 9056501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994009 + 62500 = 997^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056509 - 2⁴ = 1056493 is a prime.

It is a super-2 number, since 2×1056509² = 2232422534162, which contains 22 as substring.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528254 + 528255.

It is an arithmetic number, because the mean of its divisors is an integer number (528255).

2^1056509 is an apocalyptic number.

It is an amenable number.

1056509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056509 is an equidigital number, since it uses as much as digits as its factorization.

1056509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 1056509 is about 1027.8662364335. The cubic root of 1056509 is about 101.8492261696.

The spelling of 1056509 in words is "one million, fifty-six thousand, five hundred nine".