1590991 has 2 divisors, whose sum is σ = 1590992. Its totient is φ = 1590990.

The previous prime is 1590961. The next prime is 1591001. The reversal of 1590991 is 1990951.

It is a strong prime.

It is an emirp because it is prime and its reverse (1990951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1590991 - 2¹³ = 1582799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1590931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795495 + 795496.

It is an arithmetic number, because the mean of its divisors is an integer number (795496).

2^1590991 is an apocalyptic number.

1590991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1590991 is an equidigital number, since it uses as much as digits as its factorization.

1590991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1590991 is about 1261.3449171420. The cubic root of 1590991 is about 116.7407755903.

The spelling of 1590991 in words is "one million, five hundred ninety thousand, nine hundred ninety-one".