5091221 has 4 divisors (see below), whose sum is σ = 5359200. Its totient is φ = 4823244.

The previous prime is 5091199. The next prime is 5091227. The reversal of 5091221 is 1221905.

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: 1221905 = 5 ⋅244381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5091221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5091193 and 5091202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5091227) 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, 133961 + ... + 133998.

It is an arithmetic number, because the mean of its divisors is an integer number (1339800).

Almost surely, 2^5091221 is an apocalyptic number.

It is an amenable number.

5091221 is a deficient number, since it is larger than the sum of its proper divisors (267979).

5091221 is a wasteful number, since it uses less digits than its factorization.

5091221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267978.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 5091221 is about 2256.3734176771. The cubic root of 5091221 is about 172.0312386924.

The spelling of 5091221 in words is "five million, ninety-one thousand, two hundred twenty-one".