1071689 has 4 divisors (see below), whose sum is σ = 1096656. Its totient is φ = 1046724.

The previous prime is 1071683. The next prime is 1071703. The reversal of 1071689 is 9861701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9861701 = 283 ⋅34847.

It is a cyclic number.

It is not a de Polignac number, because 1071689 - 2¹² = 1067593 is a prime.

It is a super-2 number, since 2×1071689² = 2297034625442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1071683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12419 + ... + 12504.

It is an arithmetic number, because the mean of its divisors is an integer number (274164).

2^1071689 is an apocalyptic number.

It is an amenable number.

1071689 is a deficient number, since it is larger than the sum of its proper divisors (24967).

1071689 is an equidigital number, since it uses as much as digits as its factorization.

1071689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24966.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1071689 is about 1035.2241303215. The cubic root of 1071689 is about 102.3347008509.

The spelling of 1071689 in words is "one million, seventy-one thousand, six hundred eighty-nine".