1101601681 has 2 divisors, whose sum is σ = 1101601682. Its totient is φ = 1101601680.

The previous prime is 1101601679. The next prime is 1101601687. The reversal of 1101601681 is 1861061011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 938809600 + 162792081 = 30640^2 + 12759^2 .

It is an emirp because it is prime and its reverse (1861061011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1101601681 - 2¹ = 1101601679 is a prime.

It is a super-2 number, since 2×1101601681² = 2427052527164051522, which contains 22 as substring.

Together with 1101601679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1101601687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550800840 + 550800841.

It is an arithmetic number, because the mean of its divisors is an integer number (550800841).

Almost surely, 2^1101601681 is an apocalyptic number.

It is an amenable number.

1101601681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101601681 is an equidigital number, since it uses as much as digits as its factorization.

1101601681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1101601681 is about 33190.3853698628. The cubic root of 1101601681 is about 1032.7808977635.

Adding to 1101601681 its reverse (1861061011), we get a palindrome (2962662692).

The spelling of 1101601681 in words is "one billion, one hundred one million, six hundred one thousand, six hundred eighty-one".