1641278803 has 2 divisors, whose sum is σ = 1641278804. Its totient is φ = 1641278802.

The previous prime is 1641278797. The next prime is 1641278851. The reversal of 1641278803 is 3088721461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641278803 - 2¹⁷ = 1641147731 is a prime.

It is a super-2 number, since 2×1641278803² = 5387592218354225618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1641278003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820639401 + 820639402.

It is an arithmetic number, because the mean of its divisors is an integer number (820639402).

Almost surely, 2^1641278803 is an apocalyptic number.

1641278803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641278803 is an equidigital number, since it uses as much as digits as its factorization.

1641278803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1641278803 is about 40512.6992805960. The cubic root of 1641278803 is about 1179.5801443664.

The spelling of 1641278803 in words is "one billion, six hundred forty-one million, two hundred seventy-eight thousand, eight hundred three".