1331422621 has 2 divisors, whose sum is σ = 1331422622. Its totient is φ = 1331422620.

The previous prime is 1331422559. The next prime is 1331422639. The reversal of 1331422621 is 1262241331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1003305625 + 328116996 = 31675^2 + 18114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331422621 - 2⁷ = 1331422493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331422121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665711310 + 665711311.

It is an arithmetic number, because the mean of its divisors is an integer number (665711311).

Almost surely, 2^1331422621 is an apocalyptic number.

It is an amenable number.

1331422621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331422621 is an equidigital number, since it uses as much as digits as its factorization.

1331422621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 1331422621 is about 36488.6642808421. The cubic root of 1331422621 is about 1100.1164121977.

Adding to 1331422621 its reverse (1262241331), we get a palindrome (2593663952).

The spelling of 1331422621 in words is "one billion, three hundred thirty-one million, four hundred twenty-two thousand, six hundred twenty-one".