7507121 has 8 divisors (see below), whose sum is σ = 7642824. Its totient is φ = 7372800.

The previous prime is 7507103. The next prime is 7507127. The reversal of 7507121 is 1217057.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2217121 + 5290000 = 1489^2 + 2300^2 .

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 7507121 - 2⁶ = 7507057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7507127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18521 + ... + 18921.

It is an arithmetic number, because the mean of its divisors is an integer number (955353).

Almost surely, 2^7507121 is an apocalyptic number.

It is an amenable number.

7507121 is a deficient number, since it is larger than the sum of its proper divisors (135703).

7507121 is a wasteful number, since it uses less digits than its factorization.

7507121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 7507121 is about 2739.9125898466. The cubic root of 7507121 is about 195.8053130676.

Subtracting from 7507121 its reverse (1217057), we obtain a square (6290064 = 2508²).

The spelling of 7507121 in words is "seven million, five hundred seven thousand, one hundred twenty-one".