5621641 has 3 divisors (see below), whose sum is σ = 5624013. Its totient is φ = 5619270.

The previous prime is 5621617. The next prime is 5621653. The reversal of 5621641 is 1461265.

The square root of 5621641 is 2371.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 5621641 - 2⁷ = 5621513 is a prime.

It is a Duffinian number.

5621641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5627641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1186 + ... + 3556.

It is an arithmetic number, because the mean of its divisors is an integer number (1874671).

Almost surely, 2^5621641 is an apocalyptic number.

5621641 is the 2371-st square number.

5621641 is the 1186-th centered octagonal number.

It is an amenable number.

5621641 is a deficient number, since it is larger than the sum of its proper divisors (2372).

5621641 is an frugal number, since it uses more digits than its factorization.

5621641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742 (or 2371 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The cubic root of 5621641 is about 177.8092578657.

Multiplying 5621641 by its sum of digits (25), we get a square (140541025 = 11855²).

The spelling of 5621641 in words is "five million, six hundred twenty-one thousand, six hundred forty-one".