5504401621 has 2 divisors, whose sum is σ = 5504401622. Its totient is φ = 5504401620.

The previous prime is 5504401619. The next prime is 5504401667. The reversal of 5504401621 is 1261044055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4697046225 + 807355396 = 68535^2 + 28414^2 .

It is a cyclic number.

It is not a de Polignac number, because 5504401621 - 2¹ = 5504401619 is a prime.

Together with 5504401619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 5504401621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5504404621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2752200810 + 2752200811.

It is an arithmetic number, because the mean of its divisors is an integer number (2752200811).

Almost surely, 2^5504401621 is an apocalyptic number.

It is an amenable number.

5504401621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5504401621 is an equidigital number, since it uses as much as digits as its factorization.

5504401621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 5504401621 is about 74191.6546587283. The cubic root of 5504401621 is about 1765.6449286292.

Adding to 5504401621 its reverse (1261044055), we get a palindrome (6765445676).

The spelling of 5504401621 in words is "five billion, five hundred four million, four hundred one thousand, six hundred twenty-one".