1641247 has 4 divisors (see below), whose sum is σ = 1651480. Its totient is φ = 1631016.

The previous prime is 1641229. The next prime is 1641253. The reversal of 1641247 is 7421461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7421461 = 811 ⋅9151.

It is a cyclic number.

It is not a de Polignac number, because 1641247 - 2¹¹ = 1639199 is a prime.

It is a Duffinian number.

1641247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641217) 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, 4872 + ... + 5197.

It is an arithmetic number, because the mean of its divisors is an integer number (412870).

2^1641247 is an apocalyptic number.

1641247 is a deficient number, since it is larger than the sum of its proper divisors (10233).

1641247 is a wasteful number, since it uses less digits than its factorization.

1641247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10232.

The product of its digits is 1344, while the sum is 25.

The square root of 1641247 is about 1281.1116266743. Note that the first 3 decimals coincide. The cubic root of 1641247 is about 117.9572525423.

The spelling of 1641247 in words is "one million, six hundred forty-one thousand, two hundred forty-seven".