1791649 has 4 divisors (see below), whose sum is σ = 1853460. Its totient is φ = 1729840.

The previous prime is 1791637. The next prime is 1791679. The reversal of 1791649 is 9461971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9461971 = 1451 ⋅6521.

It can be written as a sum of positive squares in 2 ways, for example, as 351649 + 1440000 = 593^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791649 - 2⁵ = 1791617 is a prime.

It is a super-2 number, since 2×1791649² = 6420012278402, which contains 22 as substring.

It is a Duffinian number.

1791649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1791679) 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 in 3 ways as a sum of consecutive naturals, for example, 30862 + ... + 30919.

It is an arithmetic number, because the mean of its divisors is an integer number (463365).

2^1791649 is an apocalyptic number.

It is an amenable number.

1791649 is a deficient number, since it is larger than the sum of its proper divisors (61811).

1791649 is an equidigital number, since it uses as much as digits as its factorization.

1791649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61810.

The product of its digits is 13608, while the sum is 37.

The square root of 1791649 is about 1338.5249343961. The cubic root of 1791649 is about 121.4556279797.

The spelling of 1791649 in words is "one million, seven hundred ninety-one thousand, six hundred forty-nine".