1213840841 has 2 divisors, whose sum is σ = 1213840842. Its totient is φ = 1213840840.

The previous prime is 1213840813. The next prime is 1213840879. The reversal of 1213840841 is 1480483121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952339600 + 261501241 = 30860^2 + 16171^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213840841 - 2⁶ = 1213840777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213840798 and 1213840807.

It is not a weakly prime, because it can be changed into another prime (1213840811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606920420 + 606920421.

It is an arithmetic number, because the mean of its divisors is an integer number (606920421).

Almost surely, 2^1213840841 is an apocalyptic number.

It is an amenable number.

1213840841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213840841 is an equidigital number, since it uses as much as digits as its factorization.

1213840841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1213840841 is about 34840.2187277864. The cubic root of 1213840841 is about 1066.7285414086.

The spelling of 1213840841 in words is "one billion, two hundred thirteen million, eight hundred forty thousand, eight hundred forty-one".