1841356661 has 2 divisors, whose sum is σ = 1841356662. Its totient is φ = 1841356660.

The previous prime is 1841356637. The next prime is 1841356667. The reversal of 1841356661 is 1666531481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1701975025 + 139381636 = 41255^2 + 11806^2 .

It is an emirp because it is prime and its reverse (1666531481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1841356661 - 2⁶ = 1841356597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1841356667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920678330 + 920678331.

It is an arithmetic number, because the mean of its divisors is an integer number (920678331).

Almost surely, 2^1841356661 is an apocalyptic number.

It is an amenable number.

1841356661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1841356661 is an equidigital number, since it uses as much as digits as its factorization.

1841356661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 1841356661 is about 42911.0319265338. The cubic root of 1841356661 is about 1225.6862263158.

The spelling of 1841356661 in words is "one billion, eight hundred forty-one million, three hundred fifty-six thousand, six hundred sixty-one".