7220129 has 4 divisors (see below), whose sum is σ = 8251584. Its totient is φ = 6188676.

The previous prime is 7220123. The next prime is 7220131. The reversal of 7220129 is 9210227.

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: 9210227 = 13 ⋅708479.

It is a cyclic number.

It is not a de Polignac number, because 7220129 - 2⁴ = 7220113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220123) 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, 515717 + ... + 515730.

It is an arithmetic number, because the mean of its divisors is an integer number (2062896).

Almost surely, 2^7220129 is an apocalyptic number.

It is an amenable number.

7220129 is a deficient number, since it is larger than the sum of its proper divisors (1031455).

7220129 is a wasteful number, since it uses less digits than its factorization.

7220129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031454.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 7220129 is about 2687.0297728161. The cubic root of 7220129 is about 193.2776570422.

The spelling of 7220129 in words is "seven million, two hundred twenty thousand, one hundred twenty-nine".