7121245 has 8 divisors (see below), whose sum is σ = 8564184. Its totient is φ = 5684544.

The previous prime is 7121209. The next prime is 7121263. The reversal of 7121245 is 5421217.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13689 + 7107556 = 117^2 + 2666^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7121245 - 2⁹ = 7120733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1507 + ... + 4063.

It is an arithmetic number, because the mean of its divisors is an integer number (1070523).

Almost surely, 2^7121245 is an apocalyptic number.

It is an amenable number.

7121245 is a deficient number, since it is larger than the sum of its proper divisors (1442939).

7121245 is a wasteful number, since it uses less digits than its factorization.

7121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119.

The product of its digits is 560, while the sum is 22.

The square root of 7121245 is about 2668.5660943660. The cubic root of 7121245 is about 192.3912468301.

It can be divided in two parts, 71 and 21245, that added together give a square (21316 = 146²).

The spelling of 7121245 in words is "seven million, one hundred twenty-one thousand, two hundred forty-five".