991069 has 2 divisors, whose sum is σ = 991070. Its totient is φ = 991068.

The previous prime is 991063. The next prime is 991073. The reversal of 991069 is 960199.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974169 + 16900 = 987^2 + 130^2 .

It is an emirp because it is prime and its reverse (960199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991069 - 2⁵ = 991037 is a prime.

It is a super-2 number, since 2×991069² = 1964435525522, which contains 22 as substring.

991069 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495534 + 495535.

It is an arithmetic number, because the mean of its divisors is an integer number (495535).

2⁹⁹¹⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

991069 is a deficient number, since it is larger than the sum of its proper divisors (1).

991069 is an equidigital number, since it uses as much as digits as its factorization.

991069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 991069 is about 995.5244848822. The cubic root of 991069 is about 99.7014093235.

The spelling of 991069 in words is "nine hundred ninety-one thousand, sixty-nine".