1343621553 has 4 divisors (see below), whose sum is σ = 1791495408. Its totient is φ = 895747700.

The previous prime is 1343621549. The next prime is 1343621569. The reversal of 1343621553 is 3551263431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1343621553 - 2² = 1343621549 is a prime.

It is a super-2 number, since 2×1343621553² = 3610637755372263618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1343621053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223936923 + ... + 223936928.

It is an arithmetic number, because the mean of its divisors is an integer number (447873852).

Almost surely, 2^1343621553 is an apocalyptic number.

It is an amenable number.

1343621553 is a deficient number, since it is larger than the sum of its proper divisors (447873855).

1343621553 is an equidigital number, since it uses as much as digits as its factorization.

1343621553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447873854.

The product of its digits is 32400, while the sum is 33.

The square root of 1343621553 is about 36655.4437021297. The cubic root of 1343621553 is about 1103.4660788269.

Adding to 1343621553 its reverse (3551263431), we get a palindrome (4894884984).

The spelling of 1343621553 in words is "one billion, three hundred forty-three million, six hundred twenty-one thousand, five hundred fifty-three".