5621651 has 4 divisors (see below), whose sum is σ = 6424752. Its totient is φ = 4818552.

The previous prime is 5621617. The next prime is 5621653. The reversal of 5621651 is 1561265.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1561265 = 5 ⋅312253.

It is a cyclic number.

It is not a de Polignac number, because 5621651 - 2¹⁰ = 5620627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5621651.

It is not an unprimeable number, because it can be changed into a prime (5621653) 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 in 3 ways as a sum of consecutive naturals, for example, 401540 + ... + 401553.

It is an arithmetic number, because the mean of its divisors is an integer number (1606188).

Almost surely, 2^5621651 is an apocalyptic number.

5621651 is a deficient number, since it is larger than the sum of its proper divisors (803101).

5621651 is an equidigital number, since it uses as much as digits as its factorization.

5621651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803100.

The product of its digits is 1800, while the sum is 26.

The square root of 5621651 is about 2371.0021088139. The cubic root of 5621651 is about 177.8093632971.

The spelling of 5621651 in words is "five million, six hundred twenty-one thousand, six hundred fifty-one".