1016581 has 2 divisors, whose sum is σ = 1016582. Its totient is φ = 1016580.

The previous prime is 1016573. The next prime is 1016597. The reversal of 1016581 is 1856101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 36481 = 990^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016581 - 2³ = 1016573 is a prime.

It is a super-2 number, since 2×1016581² = 2066873859122, 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 (1016681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508290 + 508291.

It is an arithmetic number, because the mean of its divisors is an integer number (508291).

2^1016581 is an apocalyptic number.

It is an amenable number.

1016581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016581 is an equidigital number, since it uses as much as digits as its factorization.

1016581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1016581 is about 1008.2564157991. The cubic root of 1016581 is about 100.5496730593.

The spelling of 1016581 in words is "one million, sixteen thousand, five hundred eighty-one".