1017661 has 4 divisors (see below), whose sum is σ = 1042524. Its totient is φ = 992800.

The previous prime is 1017649. The next prime is 1017673. The reversal of 1017661 is 1667101.

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

It is an interprime number because it is at equal distance from previous prime (1017649) and next prime (1017673).

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 931225 = 294^2 + 965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1017661 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12370 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (260631).

2^1017661 is an apocalyptic number.

It is an amenable number.

1017661 is a deficient number, since it is larger than the sum of its proper divisors (24863).

1017661 is an equidigital number, since it uses as much as digits as its factorization.

1017661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24862.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1017661 is about 1008.7918516721. The cubic root of 1017661 is about 100.5852679319.

It can be divided in two parts, 10 and 17661, that added together give a palindrome (17671).

The spelling of 1017661 in words is "one million, seventeen thousand, six hundred sixty-one".