1200091 has 4 divisors (see below), whose sum is σ = 1209384. Its totient is φ = 1190800.

The previous prime is 1200083. The next prime is 1200109. The reversal of 1200091 is 1900021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1900021 = 31 ⋅61291.

It is a cyclic number.

It is not a de Polignac number, because 1200091 - 2³ = 1200083 is a prime.

It is a Duffinian number.

1200091 is a lucky number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4450 + ... + 4711.

It is an arithmetic number, because the mean of its divisors is an integer number (302346).

2^1200091 is an apocalyptic number.

1200091 is a deficient number, since it is larger than the sum of its proper divisors (9293).

1200091 is an equidigital number, since it uses as much as digits as its factorization.

1200091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1200091 is about 1095.4866498502. The cubic root of 1200091 is about 106.2685430151.

The spelling of 1200091 in words is "one million, two hundred thousand, ninety-one".