1353644621 has 8 divisors (see below), whose sum is σ = 1568215104. Its totient is φ = 1144372320.

The previous prime is 1353644597. The next prime is 1353644623. The reversal of 1353644621 is 1264463531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1353644621 - 2⁶ = 1353644557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353644623) 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 in 7 ways as a sum of consecutive naturals, for example, 1323995 + ... + 1325016.

It is an arithmetic number, because the mean of its divisors is an integer number (196026888).

Almost surely, 2^1353644621 is an apocalyptic number.

It is an amenable number.

1353644621 is a deficient number, since it is larger than the sum of its proper divisors (214570483).

1353644621 is an equidigital number, since it uses as much as digits as its factorization.

1353644621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649091.

The product of its digits is 51840, while the sum is 35.

The square root of 1353644621 is about 36791.9097221115. The cubic root of 1353644621 is about 1106.2031409775.

The spelling of 1353644621 in words is "one billion, three hundred fifty-three million, six hundred forty-four thousand, six hundred twenty-one".