1649261 has 4 divisors (see below), whose sum is σ = 1720992. Its totient is φ = 1577532.

The previous prime is 1649251. The next prime is 1649267. The reversal of 1649261 is 1629461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1629461 = 223 ⋅7307.

It is a cyclic number.

It is not a de Polignac number, because 1649261 - 2¹⁰ = 1648237 is a prime.

It is a super-2 number, since 2×1649261² = 5440123692242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649267) 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, 35831 + ... + 35876.

It is an arithmetic number, because the mean of its divisors is an integer number (430248).

2^1649261 is an apocalyptic number.

It is an amenable number.

1649261 is a deficient number, since it is larger than the sum of its proper divisors (71731).

1649261 is an equidigital number, since it uses as much as digits as its factorization.

1649261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71730.

The product of its digits is 2592, while the sum is 29.

The square root of 1649261 is about 1284.2355702907. The cubic root of 1649261 is about 118.1489309782.

The spelling of 1649261 in words is "one million, six hundred forty-nine thousand, two hundred sixty-one".