1996091 has 2 divisors, whose sum is σ = 1996092. Its totient is φ = 1996090.

The previous prime is 1996087. The next prime is 1996097. The reversal of 1996091 is 1906991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1996091 - 2² = 1996087 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1996097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998045 + 998046.

It is an arithmetic number, because the mean of its divisors is an integer number (998046).

2^1996091 is an apocalyptic number.

1996091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996091 is an equidigital number, since it uses as much as digits as its factorization.

1996091 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 35.

The square root of 1996091 is about 1412.8308462091. The cubic root of 1996091 is about 125.9099675973.

The spelling of 1996091 in words is "one million, nine hundred ninety-six thousand, ninety-one".