1353998621 has 2 divisors, whose sum is σ = 1353998622. Its totient is φ = 1353998620.

The previous prime is 1353998573. The next prime is 1353998623. The reversal of 1353998621 is 1268993531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1049112100 + 304886521 = 32390^2 + 17461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353998621 - 2¹⁰ = 1353997597 is a prime.

Together with 1353998623, 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 (1353998623) 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, 676999310 + 676999311.

It is an arithmetic number, because the mean of its divisors is an integer number (676999311).

Almost surely, 2^1353998621 is an apocalyptic number.

It is an amenable number.

1353998621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1353998621 is an equidigital number, since it uses as much as digits as its factorization.

1353998621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 1353998621 is about 36796.7202478699. The cubic root of 1353998621 is about 1106.2995625873.

The spelling of 1353998621 in words is "one billion, three hundred fifty-three million, nine hundred ninety-eight thousand, six hundred twenty-one".