7212581 has 4 divisors (see below), whose sum is σ = 7217964. Its totient is φ = 7207200.

The previous prime is 7212577. The next prime is 7212599. The reversal of 7212581 is 1852127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1852127 = 191 ⋅9697.

It can be written as a sum of positive squares in 2 ways, for example, as 1288225 + 5924356 = 1135^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 7212581 - 2² = 7212577 is a prime.

It is a super-2 number, since 2×7212581² = 104042649363122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7212581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7212551) 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 3 ways as a sum of consecutive naturals, for example, 1091 + ... + 3951.

It is an arithmetic number, because the mean of its divisors is an integer number (1804491).

Almost surely, 2^7212581 is an apocalyptic number.

It is an amenable number.

7212581 is a deficient number, since it is larger than the sum of its proper divisors (5383).

7212581 is a wasteful number, since it uses less digits than its factorization.

7212581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its digits is 1120, while the sum is 26.

The square root of 7212581 is about 2685.6248807307. The cubic root of 7212581 is about 193.2102820493.

The spelling of 7212581 in words is "seven million, two hundred twelve thousand, five hundred eighty-one".