1041991 has 2 divisors, whose sum is σ = 1041992. Its totient is φ = 1041990.

The previous prime is 1041983. The next prime is 1042001. The reversal of 1041991 is 1991401.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1041991 - 2³ = 1041983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1041961) 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 as a sum of consecutive naturals, namely, 520995 + 520996.

It is an arithmetic number, because the mean of its divisors is an integer number (520996).

2^1041991 is an apocalyptic number.

1041991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1041991 is an equidigital number, since it uses as much as digits as its factorization.

1041991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1041991 is about 1020.7796040282. The cubic root of 1041991 is about 101.3805530257.

The spelling of 1041991 in words is "one million, forty-one thousand, nine hundred ninety-one".