1591201 has 4 divisors (see below), whose sum is σ = 1646100. Its totient is φ = 1536304.

The previous prime is 1591189. The next prime is 1591207. The reversal of 1591201 is 1021951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 1134225 = 676^2 + 1065^2 .

It is not a de Polignac number, because 1591201 - 2¹⁹ = 1066913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1591207) 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, 27406 + ... + 27463.

It is an arithmetic number, because the mean of its divisors is an integer number (411525).

2^1591201 is an apocalyptic number.

It is an amenable number.

1591201 is a deficient number, since it is larger than the sum of its proper divisors (54899).

1591201 is an equidigital number, since it uses as much as digits as its factorization.

1591201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54898.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1591201 is about 1261.4281588739. The cubic root of 1591201 is about 116.7459116941.

The spelling of 1591201 in words is "one million, five hundred ninety-one thousand, two hundred one".