7121530 has 32 divisors (see below), whose sum is σ = 14288400. Its totient is φ = 2537472.

The previous prime is 7121519. The next prime is 7121533. The reversal of 7121530 is 351217.

It can be written as a sum of positive squares in 8 ways, for example, as 1771561 + 5349969 = 1331^2 + 2313^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7121498 and 7121507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121533) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2826 + ... + 4714.

Almost surely, 2^7121530 is an apocalyptic number.

7121530 is an abundant number, since it is smaller than the sum of its proper divisors (7166870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7121530 is a wasteful number, since it uses less digits than its factorization.

7121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 7121530 is about 2668.6194932961. The cubic root of 7121530 is about 192.3938133652.

Adding to 7121530 its reverse (351217), we get a palindrome (7472747).

The spelling of 7121530 in words is "seven million, one hundred twenty-one thousand, five hundred thirty".