1069991 has 4 divisors (see below), whose sum is σ = 1152312. Its totient is φ = 987672.

The previous prime is 1069987. The next prime is 1070009. The reversal of 1069991 is 1999601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1999601 = 409 ⋅4889.

It is a cyclic number.

It is not a de Polignac number, because 1069991 - 2² = 1069987 is a prime.

It is a super-2 number, since 2×1069991² = 2289761480162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1069921) 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, 41141 + ... + 41166.

It is an arithmetic number, because the mean of its divisors is an integer number (288078).

2^1069991 is an apocalyptic number.

1069991 is a deficient number, since it is larger than the sum of its proper divisors (82321).

1069991 is an equidigital number, since it uses as much as digits as its factorization.

1069991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82320.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1069991 is about 1034.4036929555. The cubic root of 1069991 is about 102.2806254073.

The spelling of 1069991 in words is "one million, sixty-nine thousand, nine hundred ninety-one".