5651221 has 4 divisors (see below), whose sum is σ = 5719392. Its totient is φ = 5583052.

The previous prime is 5651183. The next prime is 5651237. The reversal of 5651221 is 1221565.

It is the 971-st star number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221565 = 5 ⋅244313.

It is a cyclic number.

It is not a de Polignac number, because 5651221 - 2²¹ = 3554069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5651192 and 5651201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33961 + ... + 34126.

It is an arithmetic number, because the mean of its divisors is an integer number (1429848).

Almost surely, 2^5651221 is an apocalyptic number.

It is an amenable number.

5651221 is a deficient number, since it is larger than the sum of its proper divisors (68171).

5651221 is an equidigital number, since it uses as much as digits as its factorization.

5651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68170.

The product of its digits is 600, while the sum is 22.

The square root of 5651221 is about 2377.2296902066. The cubic root of 5651221 is about 178.1205785709.

Adding to 5651221 its reverse (1221565), we get a palindrome (6872786).

The spelling of 5651221 in words is "five million, six hundred fifty-one thousand, two hundred twenty-one".