1641506 has 4 divisors (see below), whose sum is σ = 2462262. Its totient is φ = 820752.

The previous prime is 1641473. The next prime is 1641509. The reversal of 1641506 is 6051461.

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

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 116281 = 1235^2 + 341^2 .

It is not an unprimeable number, because it can be changed into a prime (1641509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410375 + ... + 410378.

2^1641506 is an apocalyptic number.

1641506 is a deficient number, since it is larger than the sum of its proper divisors (820756).

1641506 is an equidigital number, since it uses as much as digits as its factorization.

1641506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820755.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1641506 is about 1281.2127067743. The cubic root of 1641506 is about 117.9634570363.

Adding to 1641506 its reverse (6051461), we get a palindrome (7692967).

The spelling of 1641506 in words is "one million, six hundred forty-one thousand, five hundred six".