1290091 has 4 divisors (see below), whose sum is σ = 1407384. Its totient is φ = 1172800.

The previous prime is 1290083. The next prime is 1290109. The reversal of 1290091 is 1900921.

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 1290091 - 2³ = 1290083 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1290031) 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, 58630 + ... + 58651.

It is an arithmetic number, because the mean of its divisors is an integer number (351846).

2^1290091 is an apocalyptic number.

1290091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1290091 is a deficient number, since it is larger than the sum of its proper divisors (117293).

1290091 is a wasteful number, since it uses less digits than its factorization.

1290091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117292.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1290091 is about 1135.8217289698. The cubic root of 1290091 is about 108.8612830122.

It can be divided in two parts, 1 and 290091, that added together give a palindrome (290092).

The spelling of 1290091 in words is "one million, two hundred ninety thousand, ninety-one".