1801841037509 has 2 divisors, whose sum is σ = 1801841037510. Its totient is φ = 1801841037508.

The previous prime is 1801841037499. The next prime is 1801841037569. The reversal of 1801841037509 is 9057301481081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1786686688900 + 15154348609 = 1336670^2 + 123103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1801841037509 is a prime.

It is a super-2 number, since 2×1801841037509² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801841037569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900920518754 + 900920518755.

It is an arithmetic number, because the mean of its divisors is an integer number (900920518755).

Almost surely, 2^{1801841037509} is an apocalyptic number.

It is an amenable number.

1801841037509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801841037509 is an equidigital number, since it uses as much as digits as its factorization.

1801841037509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 1801841037509 in words is "one trillion, eight hundred one billion, eight hundred forty-one million, thirty-seven thousand, five hundred nine".