1001804981 has 2 divisors, whose sum is σ = 1001804982. Its totient is φ = 1001804980.

The previous prime is 1001804957. The next prime is 1001805011. The reversal of 1001804981 is 1894081001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593360881 + 408444100 = 24359^2 + 20210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001804981 - 2¹⁸ = 1001542837 is a prime.

It is a super-2 number, since 2×1001804981² = 2007226439912820722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001854981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500902490 + 500902491.

It is an arithmetic number, because the mean of its divisors is an integer number (500902491).

Almost surely, 2^1001804981 is an apocalyptic number.

It is an amenable number.

1001804981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001804981 is an equidigital number, since it uses as much as digits as its factorization.

1001804981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 1001804981 is about 31651.3029905563. The cubic root of 1001804981 is about 1000.6012987007.

Adding to 1001804981 its reverse (1894081001), we get a palindrome (2895885982).

It can be divided in two parts, 100 and 1804981, that added together give a palindrome (1805081).

The spelling of 1001804981 in words is "one billion, one million, eight hundred four thousand, nine hundred eighty-one".