1994442001 has 2 divisors, whose sum is σ = 1994442002. Its totient is φ = 1994442000.

The previous prime is 1994441983. The next prime is 1994442017. The reversal of 1994442001 is 1002444991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1747323601 + 247118400 = 41801^2 + 15720^2 .

It is an emirp because it is prime and its reverse (1002444991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1994442001 - 2²⁷ = 1860224273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994442041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997221000 + 997221001.

It is an arithmetic number, because the mean of its divisors is an integer number (997221001).

Almost surely, 2^1994442001 is an apocalyptic number.

It is an amenable number.

1994442001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994442001 is an equidigital number, since it uses as much as digits as its factorization.

1994442001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1994442001 is about 44659.1760000115. The cubic root of 1994442001 is about 1258.7528604371.

Adding to 1994442001 its reverse (1002444991), we get a palindrome (2996886992).

The spelling of 1994442001 in words is "one billion, nine hundred ninety-four million, four hundred forty-two thousand, one".