1371441821 has 2 divisors, whose sum is σ = 1371441822. Its totient is φ = 1371441820.

The previous prime is 1371441809. The next prime is 1371441823. The reversal of 1371441821 is 1281441731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279492900 + 91948921 = 35770^2 + 9589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1371441821 is a prime.

Together with 1371441823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371441823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685720910 + 685720911.

It is an arithmetic number, because the mean of its divisors is an integer number (685720911).

Almost surely, 2^1371441821 is an apocalyptic number.

It is an amenable number.

1371441821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371441821 is an equidigital number, since it uses as much as digits as its factorization.

1371441821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 1371441821 is about 37032.9828801300. The cubic root of 1371441821 is about 1111.0300264936.

The spelling of 1371441821 in words is "one billion, three hundred seventy-one million, four hundred forty-one thousand, eight hundred twenty-one".