7125581 has 4 divisors (see below), whose sum is σ = 7134012. Its totient is φ = 7117152.

The previous prime is 7125553. The next prime is 7125583. The reversal of 7125581 is 1855217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5248681 + 1876900 = 2291^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 7125581 - 2¹⁴ = 7109197 is a prime.

It is a super-2 number, since 2×7125581² = 101547809175122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125583) 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 3 ways as a sum of consecutive naturals, for example, 2786 + ... + 4691.

It is an arithmetic number, because the mean of its divisors is an integer number (1783503).

Almost surely, 2^7125581 is an apocalyptic number.

It is an amenable number.

7125581 is a deficient number, since it is larger than the sum of its proper divisors (8431).

7125581 is an equidigital number, since it uses as much as digits as its factorization.

7125581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8430.

The product of its digits is 2800, while the sum is 29.

The square root of 7125581 is about 2669.3783920606. The cubic root of 7125581 is about 192.4302867823.

It can be divided in two parts, 71 and 25581, that added together give a palindrome (25652).

The spelling of 7125581 in words is "seven million, one hundred twenty-five thousand, five hundred eighty-one".