1146991 has 4 divisors (see below), whose sum is σ = 1151712. Its totient is φ = 1142272.

The previous prime is 1146989. The next prime is 1147009. The reversal of 1146991 is 1996411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1146991 - 2¹ = 1146989 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1146911) 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, 1975 + ... + 2488.

It is an arithmetic number, because the mean of its divisors is an integer number (287928).

2^1146991 is an apocalyptic number.

1146991 is a deficient number, since it is larger than the sum of its proper divisors (4721).

1146991 is an equidigital number, since it uses as much as digits as its factorization.

1146991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720.

The product of its digits is 1944, while the sum is 31.

The square root of 1146991 is about 1070.9766570752. The cubic root of 1146991 is about 104.6774987550.

The spelling of 1146991 in words is "one million, one hundred forty-six thousand, nine hundred ninety-one".