1071661 has 2 divisors, whose sum is σ = 1071662. Its totient is φ = 1071660.

The previous prime is 1071659. The next prime is 1071671. The reversal of 1071661 is 1661701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 447561 = 790^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071661 - 2¹ = 1071659 is a prime.

It is a super-3 number, since 3×1071661³ = 3692270692256933343, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1071659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535830 + 535831.

It is an arithmetic number, because the mean of its divisors is an integer number (535831).

2^1071661 is an apocalyptic number.

It is an amenable number.

1071661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071661 is an equidigital number, since it uses as much as digits as its factorization.

1071661 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1071661 is about 1035.2106065917. The cubic root of 1071661 is about 102.3338096109. Note that the first 3 decimals are identical.

The spelling of 1071661 in words is "one million, seventy-one thousand, six hundred sixty-one".