1117681 has 2 divisors, whose sum is σ = 1117682. Its totient is φ = 1117680.

The previous prime is 1117679. The next prime is 1117709. The reversal of 1117681 is 1867111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 147456 = 985^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117681 - 2¹ = 1117679 is a prime.

It is a super-2 number, since 2×1117681² = 2498421635522, which contains 22 as substring.

Together with 1117679, it forms a pair of twin primes.

It is a plaindrome in base 7.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558840 + 558841.

It is an arithmetic number, because the mean of its divisors is an integer number (558841).

2^1117681 is an apocalyptic number.

It is an amenable number.

1117681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117681 is an equidigital number, since it uses as much as digits as its factorization.

1117681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 25.

The square root of 1117681 is about 1057.2043321894. The cubic root of 1117681 is about 103.7781575483.

It can be divided in two parts, 11 and 17681, that multiplied together give a palindrome (194491).

The spelling of 1117681 in words is "one million, one hundred seventeen thousand, six hundred eighty-one".