7220251 has 4 divisors (see below), whose sum is σ = 7226352. Its totient is φ = 7214152.

The previous prime is 7220249. The next prime is 7220261. The reversal of 7220251 is 1520227.

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 a cyclic number.

It is not a de Polignac number, because 7220251 - 2¹ = 7220249 is a prime.

It is a Duffinian number.

7220251 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7220201) 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, 640 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (1806588).

Almost surely, 2^7220251 is an apocalyptic number.

7220251 is a deficient number, since it is larger than the sum of its proper divisors (6101).

7220251 is a wasteful number, since it uses less digits than its factorization.

7220251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6100.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7220251 is about 2687.0524743667. The cubic root of 7220251 is about 193.2787456535.

Adding to 7220251 its reverse (1520227), we get a palindrome (8740478).

The spelling of 7220251 in words is "seven million, two hundred twenty thousand, two hundred fifty-one".