1117661 has 2 divisors, whose sum is σ = 1117662. Its totient is φ = 1117660.

The previous prime is 1117657. The next prime is 1117673. The reversal of 1117661 is 1667111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1012036 + 105625 = 1006^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117661 - 2² = 1117657 is a prime.

It is a super-2 number, since 2×1117661² = 2498332221842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1117601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558830 + 558831.

It is an arithmetic number, because the mean of its divisors is an integer number (558831).

2^1117661 is an apocalyptic number.

It is an amenable number.

1117661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117661 is an equidigital number, since it uses as much as digits as its factorization.

1117661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 23.

The square root of 1117661 is about 1057.1948732377. The cubic root of 1117661 is about 103.7775385358. Note that the first 3 decimals are identical.

The spelling of 1117661 in words is "one million, one hundred seventeen thousand, six hundred sixty-one".