1641403 has 2 divisors, whose sum is σ = 1641404. Its totient is φ = 1641402.

The previous prime is 1641389. The next prime is 1641407. The reversal of 1641403 is 3041461.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3041461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641403 - 2¹³ = 1633211 is a prime.

1641403 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1641407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820701 + 820702.

It is an arithmetic number, because the mean of its divisors is an integer number (820702).

2^1641403 is an apocalyptic number.

1641403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641403 is an equidigital number, since it uses as much as digits as its factorization.

1641403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1641403 is about 1281.1725098518. The cubic root of 1641403 is about 117.9609896902.

Adding to 1641403 its reverse (3041461), we get a palindrome (4682864).

The spelling of 1641403 in words is "one million, six hundred forty-one thousand, four hundred three".